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Merge pull request #1 from SyncfusionExamples/ES-21126
To prevent the user from selecting more than a specific number of rows in a WinForms DataGrid.
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‎PreventSelection.gif‎

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‎README.md‎

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# How-to-prevent-the-user-from-selecting-more-than-a-specific-number-of-rows-in-a-WinForms-DataGrid
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This demo shows how to prevent the user from selecting more than a specific number of rows in a WinForms DataGrid
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# How to prevent the user from selecting more than a specific number of rows in a WinForms DataGrid?
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In [WinForms DataGrid](https://www.syncfusion.com/winforms-ui-controls/datagrid) (SfDataGrid), limiting selection to a maximum of two can be achieved by handling the [SelectionChanging](https://help.syncfusion.com/cr/windowsforms/Syncfusion.WinForms.DataGrid.SfDataGrid.html#Syncfusion_WinForms_DataGrid_SfDataGrid_SelectionChanging) event. Within this event, logic can be applied to evaluate the counts of [SelectedItems](https://help.syncfusion.com/cr/windowsforms/Syncfusion.WinForms.DataGrid.SfDataGrid.html#Syncfusion_WinForms_DataGrid_SfDataGrid_SelectedItems), **RemovedItems**, and **AddedItems**. If the total number of selected rows exceeds two, the selection process can be cancelled by setting **e.cancel** to **true**.
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```csharp
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//Event subscription
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sfDataGrid1.SelectionChanging += OnSelectionChanging;
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//Event customization
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private void OnSelectionChanging(object sender, SelectionChangingEventArgs e)
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{
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var dataGrid = (sender as SfDataGrid);
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if (dataGrid != null && (dataGrid.SelectedItems.Count + e.AddedItems.Count - e.RemovedItems.Count > 2))
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{
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// Cancel the selection above 2 rows
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e.Cancel = true;
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}
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}
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```
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![Prevent the selection](PreventSelection.gif)
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Take a moment to peruse the [WinForms DataGrid - Selection](https://help.syncfusion.com/windowsforms/datagrid/selection) documentation, to learn more about selection with examples.

‎SfDataGridDemo/App.config‎

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<?xml version="1.0" encoding="utf-8"?>
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<configuration>
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<startup>
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<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
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</startup>
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</configuration>

‎SfDataGridDemo/Form1.Designer.cs‎

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‎SfDataGridDemo/Form1.cs‎

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using SfDataGrid_Demo;
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using Syncfusion.WinForms.DataGrid;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using Syncfusion.WinForms.DataGrid.Events;
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using Syncfusion.WinForms.DataGrid.Enums;
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namespace SfDataGrid_Demo
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{
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public partial class Form1 : Form
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{
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OrderInfoCollection orderInfo;
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public Form1()
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{
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InitializeComponent();
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orderInfo = new OrderInfoCollection();
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sfDataGrid1.AutoGenerateColumns = false;
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sfDataGrid1.SelectionMode = GridSelectionMode.Multiple;
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sfDataGrid1.DataSource = orderInfo.Orders;
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sfDataGrid1.Columns.Add(new GridNumericColumn() { MappingName = "OrderID", HeaderText = "Order ID", AllowEditing = false });
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sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "CustomerID", HeaderText = "Customer ID" , AllowEditing = true});
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sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "CustomerName", HeaderText = "Name", AllowEditing = false });
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sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "Country", HeaderText = "Country" , AllowEditing = true });
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sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "ShipCity", HeaderText = "Ship City" , AllowEditing = false });
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//Event subscription
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sfDataGrid1.SelectionChanging += OnSelectionChanging;
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}
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//Event customization
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private void OnSelectionChanging(object sender, SelectionChangingEventArgs e)
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{
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var dataGrid = (sender as SfDataGrid);
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if (dataGrid != null && (dataGrid.SelectedItems.Count + e.AddedItems.Count - e.RemovedItems.Count > 2))
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{
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// Cancel the selection above 2 rows
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e.Cancel = true;
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}
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}
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}
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}

‎SfDataGridDemo/Form1.resx‎

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<?xml version="1.0" encoding="utf-8"?>
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<root>
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<!--
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Microsoft ResX Schema
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Version 2.0
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The primary goals of this format is to allow a simple XML format
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that is mostly human readable. The generation and parsing of the
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various data types are done through the TypeConverter classes
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associated with the data types.
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Example:
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... ado.net/XML headers & schema ...
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<resheader name="resmimetype">text/microsoft-resx</resheader>
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<resheader name="version">2.0</resheader>
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<resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
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<resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
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<data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
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<data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
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<data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
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<value>[base64 mime encoded serialized .NET Framework object]</value>
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</data>
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<data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
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<value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
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<comment>This is a comment</comment>
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</data>
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There are any number of "resheader" rows that contain simple
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name/value pairs.
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Each data row contains a name, and value. The row also contains a
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type or mimetype. Type corresponds to a .NET class that support
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text/value conversion through the TypeConverter architecture.
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Classes that don't support this are serialized and stored with the
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mimetype set.
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The mimetype is used for serialized objects, and tells the
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ResXResourceReader how to depersist the object. This is currently not
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extensible. For a given mimetype the value must be set accordingly:
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Note - application/x-microsoft.net.object.binary.base64 is the format
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that the ResXResourceWriter will generate, however the reader can
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read any of the formats listed below.
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mimetype: application/x-microsoft.net.object.binary.base64
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value : The object must be serialized with
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: System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
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: and then encoded with base64 encoding.
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mimetype: application/x-microsoft.net.object.soap.base64
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value : The object must be serialized with
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: System.Runtime.Serialization.Formatters.Soap.SoapFormatter
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: and then encoded with base64 encoding.
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mimetype: application/x-microsoft.net.object.bytearray.base64
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value : The object must be serialized into a byte array
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: using a System.ComponentModel.TypeConverter
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: and then encoded with base64 encoding.
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-->
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<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
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<xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
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<xsd:element name="root" msdata:IsDataSet="true">
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<xsd:complexType>
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<xsd:choice maxOccurs="unbounded">
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<xsd:element name="metadata">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" />
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</xsd:sequence>
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<xsd:attribute name="name" use="required" type="xsd:string" />
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<xsd:attribute name="type" type="xsd:string" />
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<xsd:attribute name="mimetype" type="xsd:string" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="assembly">
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<xsd:complexType>
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<xsd:attribute name="alias" type="xsd:string" />
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<xsd:attribute name="name" type="xsd:string" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="data">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
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<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
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<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
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<xsd:attribute ref="xml:space" />
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</xsd:complexType>
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</xsd:element>
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<xsd:element name="resheader">
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<xsd:complexType>
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<xsd:sequence>
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<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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</xsd:sequence>
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<xsd:attribute name="name" type="xsd:string" use="required" />
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</xsd:complexType>
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</xsd:element>
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</xsd:choice>
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</xsd:complexType>
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</xsd:element>
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</xsd:schema>
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<resheader name="resmimetype">
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<value>text/microsoft-resx</value>
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</resheader>
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<resheader name="version">
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<value>2.0</value>
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</resheader>
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<resheader name="reader">
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<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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<resheader name="writer">
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<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
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</resheader>
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</root>

‎SfDataGridDemo/Model/Model.cs‎

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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace SfDataGrid_Demo
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{
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public class OrderInfo : INotifyPropertyChanged
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{
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int orderID;
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string customerId;
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string country;
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string customerName;
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string shipCity;
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public int OrderID
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{
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get { return orderID; }
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set
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{
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orderID = value;
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OnPropertyChanged("OrderID");
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}
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}
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public string CustomerID
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{
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get { return customerId; }
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set
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{
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customerId = value;
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OnPropertyChanged("CustomerID");
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}
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}
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public string CustomerName
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{
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get { return customerName; }
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set
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{
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customerName = value;
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OnPropertyChanged("CustomerName");
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}
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}
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public string Country
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{
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get { return country; }
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set
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{
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country = value;
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OnPropertyChanged("Country");
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}
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}
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public string ShipCity
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{
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get { return shipCity; }
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set
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{
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shipCity = value;
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OnPropertyChanged("ShipCity");
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}
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}
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public OrderInfo(int orderId, string customerName, string country, string customerId, string shipCity)
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{
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this.OrderID = orderId;
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this.CustomerName = customerName;
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this.Country = country;
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this.CustomerID = customerId;
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this.ShipCity = shipCity;
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}
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public OrderInfo()
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{
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}
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public event PropertyChangedEventHandler PropertyChanged;
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public void OnPropertyChanged(string PropertyName)
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{
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if (PropertyChanged != null)
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PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
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}
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}
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}

‎SfDataGridDemo/Program.cs‎

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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace SfDataGrid_Demo
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{
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internal static class Program
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{
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/// <summary>
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/// The main entry point for the application.
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/// </summary>
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[STAThread]
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static void Main()
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{
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Application.EnableVisualStyles();
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Application.SetCompatibleTextRenderingDefault(false);
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Application.Run(new Form1());
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}
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}
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}

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