Get RowIndex and values of GridView Row Cells inside CheckChanged event when CheckBox is checked (selected) in ASP.Net

Hi @eshant.kapoor.5

You can do it like this.

 HTML

 <div>
    
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
            HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White">
            <Columns>
                <asp:TemplateField HeaderText="Select">
                    <ItemTemplate>
                        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" 
                            oncheckedchanged="CheckBox1_CheckedChanged"  />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30">
                <ItemStyle Width="30px" />
                </asp:BoundField>
                <asp:BoundField DataField="comp_name" HeaderText="Company Name" 
                    ItemStyle-Width="100">
                <ItemStyle Width="100px" />
                </asp:BoundField>
                <asp:BoundField DataField="Country" HeaderText="Country" ItemStyle-Width="100">
                <ItemStyle Width="100px" />
                </asp:BoundField>
            </Columns>
            <HeaderStyle BackColor="#3AC0F2" ForeColor="White" />
        </asp:GridView>
    
    </div>

Namespace

using System.Data;

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                    new DataColumn("comp_name", typeof(string)),
                    new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "TCS", "India");
        dt.Rows.Add(2, "McDonald", "USA");
        dt.Rows.Add(3, "Alibaba", "China");
        dt.Rows.Add(4, "Pizza Ht", "USA");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
    CheckBox chk = (CheckBox)sender;
    if (chk.Checked == true)
    {
        GridViewRow gvr = (GridViewRow)chk.NamingContainer;
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Id = " + GridView1.Rows[gvr.RowIndex].Cells[1].Text + ",  Company Name = " + GridView1.Rows[gvr.RowIndex].Cells[2].Text + ",  Country = " + GridView1.Rows[gvr.RowIndex].Cells[3].Text + "')", true);
    }
}