HOW DO I CHECK AND UNCHECK CHECKBOX IN ASP.NET

At the same time you can do it in the server side. But of you use the update panel then it will be good because avoiding the page refresh and safety execution in the server side.

You can do it like this.

bool isCheck = false;
if(chkHeader.Checked)
{
isCheck  = true;
}

for(int i=0;i{
        GridViewRow gv = gridview1.Rows[0];
        CheckBox chk = (CheckBox)  gv.FindControl("chkRow");
  
        if(isCheck)
        {
                chk.Checked = true;
        }
        else
        {
                chk.Checked = false; 
        }
}

Hope this will help you how to do it in server side.

Hi George,


Select Deselect all checkbox in gridview


Default.aspx code

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>





   
   


   

   

   
   
            
   
   
   
   
   
   
   
   
   
 

   

   

Default.aspx.vb code

Imports System.Data.SqlClient
Imports System.Data
Partial Class _Default
    Inherits System.Web.UI.Page
    Dim strConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings.Item("ConnectionString").ToString()
    Dim con As New SqlConnection(strConnString)
    Dim str As String
    Dim com As SqlCommand
    Dim sqlda As SqlDataAdapter
    Dim ds As DataSet
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        con.Open()
        str = "select * from student"
        com = New SqlCommand(Str, con)
        Dim reader As SqlDataReader
        reader = com.ExecuteReader()
        GridView1.DataSource = reader
        GridView1.DataBind()
        con.Close()
    End Sub
End Class



Also refer


http://www.c-sharpcorner.com/uploadfile/krishnasarala/checkuncheck-all-checkboxes-in-Asp-Net-gridview/default.aspx


Thanks
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