grid view inside update panel edit value get old value ?

Question

hi friends getting error when update value inside grid view :

 

girdview inside update panel when i click edit button then open popup from with value and when i will update it first time update right but when second time edit another value then it show first value comma second update value

 

 

like first time update :

1. dev to devendra  it update right

but second time i will want update another like

2. rahul to rahul sharma then it show value like:

 

",devendra, rahul sharma" how to solve this problem my code is like:

 

if (e.CommandName == "Cmd_Edit")

{

objadmin.Work_Id = Convert.ToInt32(e.CommandArgument);

ViewState["work_id"] = objadmin.Work_Id;

txt_Feedback.Text = string.Empty;

txt_fee.Text = string.Empty;

DataSet ds = objadmin.bindreport("feedone");

if (ds.Tables[0].Rows.Count > 0)

{

txt_Feedback.Text = ds.Tables[0].Rows[0]["Feedback"].ToString();

txt_fee.Text = ds.Tables[0].Rows[0]["Fee"].ToString();

ModalPopupExtender1.Show();

}

}

 

 

and update butoon code like:

 

 

feedback=txt_Feedback.Text;

objadmin.Work_Id = Convert.ToInt16(ViewState["work_id"].ToString());

fee = txt_fee.Text;

if (txt_Feedback.Text == "")

{

txt_Feedback.Text = "NULL";

}

else

{

objadmin.Feedback = feedback.Replace(",", "");

}

if (txt_fee.Text == ",")

{

objadmin.Fee = 0;

}

else

{

objadmin.Fee = Convert.ToDecimal(fee.Replace(",", ""));

}

DataSet ds = objadmin.bindreport("feedbackupdate");

txt_fee.Text = string.Empty;

txt_fee.Text = "";

txt_Feedback.Text = string.Empty;

txt_Feedback.Text = "";