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Enable/Disable CheckBox Inside the GridView Control

Introduction

In this article, you will see how to enable or disable a checkbox in GridView records based on the condition.

RowDataBound Event

A GridviewRowEventArgs object is passed to the event-handling method, that enables you to access the properties of the row being bound. To access a specific cell in the row, use the "cell" property of the GridViewRow object contained in the Row property of the GridEventRowEventArgs object.

Now let's have a look at this web application to see how to use the RowDataBound Event.

Step 1

Open Visual Studio then select "File" -> "New" -> "Website..." as in the following figure:

NewWebApp

Step 2

Now go to the Solution Explorer and add a new item as in the following figure:

NewItem

Step 3

Now add a new web form on your web application as in the following figure:

AddWebForm

Step 4

Write the following code in the "default.aspx" page:

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  
  2. <!DOCTYPE html>  
  3. <html xmlns="http://www.w3.org/1999/xhtml">  
  4. <head>  
  5. <title>Enable/Disable Checkbox in Gridview based on condtion in ASP.Net</title>  
  6. </head>  
  7. <body>  
  8. <form id="form1" runat="server">  
  9. <div>  
  10. <asp:GridView ID="gvDetails" AutoGenerateColumns="False" CellPadding="3" runat="server"  
  11. OnRowDataBound="gvDetails_RowDataBound" BackColor="White"   
  12. BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" ForeColor="Black" GridLines="Vertical">  
  13.     <AlternatingRowStyle BackColor="#CCCCCC" />  
  14. <Columns>  
  15. <asp:TemplateField>  
  16. <ItemTemplate>  
  17. <asp:CheckBox ID="chkSelect" runat="server" />  
  18. </ItemTemplate>  
  19. </asp:TemplateField>  
  20. <asp:BoundField HeaderText="UserId" DataField="UserId" />  
  21. <asp:BoundField HeaderText="UserName" DataField="UserName" />  
  22. <asp:BoundField HeaderText="Education" DataField="Education" />  
  23. <asp:BoundField HeaderText="Location" DataField="Location" />  
  24. </Columns>  
  25.     <FooterStyle BackColor="#CCCCCC" />  
  26. <HeaderStyle BackColor="Black" Font-Bold="true" ForeColor="White" />  
  27.     <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />  
  28.     <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />  
  29.     <SortedAscendingCellStyle BackColor="#F1F1F1" />  
  30.     <SortedAscendingHeaderStyle BackColor="#808080" />  
  31.     <SortedDescendingCellStyle BackColor="#CAC9C9" />  
  32.     <SortedDescendingHeaderStyle BackColor="#383838" />  
  33. </asp:GridView>  
  34. </div>  
  35. </form>  
  36. </body>  
  37. </html> 

Add the connectionstring in web.config file such like :

  1. <connectionStrings>  
  2.  <add name="dbconnection" connectionString="Data Source=; Initial Catalog=Employee;   
  3. User=abc; Password=***" providerName="SqlClient"/>  
  4. </connectionStrings> 

Step 5

Now write the following code in the "default.aspx.cs" page:

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Web;  
  5. using System.Web.UI;  
  6. using System.Data;  
  7. using System.Web.UI.WebControls;  
  8. public partial class _Default : System.Web.UI.Page  
  9. {  
  10.     protected void Page_Load(object sender, EventArgs e)  
  11.     {  
  12.         if (!IsPostBack)  
  13.         {  
  14.             BindData();  
  15.         }  
  16.     }  
  17.     protected void BindData()  
  18.     {  
  19.         DataTable dt = new DataTable();  
  20.         dt.Columns.Add("UserId", typeof(Int32));  
  21.         dt.Columns.Add("UserName", typeof(string));  
  22.         dt.Columns.Add("Education", typeof(string));  
  23.         dt.Columns.Add("Location", typeof(string));  
  24.         DataRow dtr = dt.NewRow();  
  25.         dtr["UserId"] = 1;  
  26.         dtr["UserName"] = "Pankaj Lohani";  
  27.         dtr["Education"] = "MCA";  
  28.         dtr["Location"] = "New Delhi";  
  29.         dt.Rows.Add(dtr);  
  30.         dtr = dt.NewRow();  
  31.         dtr["UserId"] = 2;  
  32.         dtr["UserName"] = "Nimit Joshi";  
  33.         dtr["Education"] = "MCA";  
  34.         dtr["Location"] = "Ghaziabad";  
  35.         dt.Rows.Add(dtr);  
  36.         dtr = dt.NewRow();  
  37.         dtr["UserId"] = 3;  
  38.         dtr["UserName"] = "Amit Senwal";  
  39.         dtr["Education"] = "BCA";  
  40.         dtr["Location"] = "Greater Noida";  
  41.         dt.Rows.Add(dtr);  
  42.         dtr = dt.NewRow();  
  43.         dtr["UserId"] = 4;  
  44.         dtr["UserName"] = "Pravesh Khanduri";  
  45.         dtr["Education"] = "BCA";  
  46.         dtr["Location"] = "Delhi";  
  47.         dt.Rows.Add(dtr);  
  48.         dtr = dt.NewRow();  
  49.         dtr["UserId"] = 5;  
  50.         dtr["UserName"] = "Ravi Kumar";  
  51.         dtr["Education"] = "BCA";  
  52.         dtr["Location"] = "Delhi";  
  53.         dt.Rows.Add(dtr);  
  54.         dtr = dt.NewRow();  
  55.         dtr["UserId"] = 6;  
  56.         dtr["UserName"] = "Ainul Hasan";  
  57.         dtr["Education"] = "MCA";  
  58.         dtr["Location"] = "Gurgaon";  
  59.         dt.Rows.Add(dtr);  
  60.         gvDetails.DataSource = dt;  
  61.         gvDetails.DataBind();  
  62.     }  
  63.     protected void gvDetails_RowDataBound(object sender, GridViewRowEventArgs e)  
  64.     {  
  65.         if (e.Row.RowType == DataControlRowType.DataRow)  
  66.         {  
  67.             CheckBox chkbox = (CheckBox)e.Row.FindControl("chkSelect");  
  68.             if (e.Row.Cells[3].Text == "BCA")  
  69.             {  
  70.                 chkbox.Enabled = false;  
  71.             }  
  72.             else  
  73.             {  
  74.                 chkbox.Enabled = true;  
  75.             }  
  76.         }  
  77.     }  
  78. } 

In the code above you saw that before the GridView control can be rendered, each row in the control must be bound to a record. The "RowDataBound" event is raised when a data row is bound to data in the GridView control. This enables you to provide an event-handling method that performs a modification of the values bound to the row, when the event occurs.

Step 6

Now debug the application by pressing F5; the output will then appear in the browser as in the following figure:

Debug

Step 7

Now you can check only the enable checkbox as in the following figure:

EnableCheckbox

Summary

ASP.NET automatically remembers whether the Checkboxes were and were not checked across postbacks. We can also programmatically access the checkbox in code to determine whether a given checkbox is checked, or to change the checked state.


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