Object reference not set to an instance of an object.

      

               

                        ');">

                        

                        

                        

                        

                        

            

         

   

         

               

         

 

         

                  

                              

                                    

                                             

                                    

                              

               

         

   

protected void txtcmd_Click(object sender, EventArgs e)

{

         string status = Convert.ToInt32(statusgrdview.DataKeys[e.RowIndex].Value);             

         string comments = ((TextBox)statusgrdview.FindControl("txtcommt")).Text;         Getting ERROR: Object reference not set to an instance of an object.       

         SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connect"].ConnectionString);

         SqlCommand cmd = new SqlCommand();

         int ID = int.Parse(Session["Id"].ToString());

         TextBox box1 = (TextBox)statusgrdview.Rows[0].Cells[0].FindControl("txtcommt");

         string k = box1.Text;

         cmd.CommandType = CommandType.Text;

         cmd.CommandText = "insert into TBL_Comments(ID,comments) " + "values(" + ID + ",@comments);" + "select * from TBL_Comments";

         cmd.Parameters.Add("@comments", SqlDbType.VarChar).Value = comments;

         statusgrdview.DataSource = GetData(cmd);

         statusgrdview.DataBind();

}