public partial class WebForm2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        GridView1.DataSource = SqlDataSource1;
        GridView1.DataBind();
    }

    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "btn")
        {
            int crow;
            crow = Convert.ToInt32(e.CommandArgument.ToString());
            string v = GridView1.Rows[crow].Cells[1].Text;
            int a = Int32.Parse(v);
            string b = "true";
            SqlConnection con = new SqlConnection("Data Source=DESKTOP-LITEG8T;Initial Catalog=UserDb;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("UPDATE Table_1 SET Status ='"+b+"' WHERE Id ='"+ a+"'", con);
            cmd.ExecuteNonQuery();
            con.Close();
            v = "";

        }
    }
}