Bind textbox value to Label in the GridView in Button Click Defined in the Grid

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Hi,

I have a grid with dynamic rows and columns.In each row I have an Button Called as "Notify". On clicking Button I want to bind text box value to a label in the grid. I have coded as below.....
On Butto_Click
{
GridViewRow row = (GridViewRow)(((Button)e.CommandSource).NamingContainer);
TextBox txtItemDescription = (TextBox)row.FindControl("txtItemDescription");
Label lbl = (Label)row.FindControl("lblItem");
lbl.Text = txtItemDescription.Text;
txtItemDescription.Visible = false;
txtItemDescription.Text = string.Empty;
SetPreviousData();
}



private void SetPreviousData()
{
int rowIndex = 0;
if (ViewState["CurrentTable"] != null)
{
DataTable dt = (DataTable)ViewState["CurrentTable"];
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
TextBox txtItemDescription =
(TextBox)grdRequestResponse.Rows[rowIndex].Cells[1].FindControl("txtItemDescription");
Label lblItem =
(Label)grdRequestResponse.Rows[rowIndex].Cells[1].FindControl("lblItem");
DropDownList ddlItemAssignedto =
(DropDownList)grdRequestResponse.Rows[rowIndex].Cells[2].FindControl("ddlItemAssignedto");
TextBox txtDateCompleted =
(TextBox)grdRequestResponse.Rows[rowIndex].Cells[3].FindControl("txtDateCompleted");


RadioButtonList rdbListCompletedasPlanned =
(RadioButtonList)grdRequestResponse.Rows[rowIndex].Cells[4].FindControl("rdbListCompletedasPlanned");

Label lblSignature =
(Label)grdRequestResponse.Rows[rowIndex].Cells[5].FindControl("lblSignature");
TextBox txtComments =
(TextBox)grdRequestResponse.Rows[rowIndex].Cells[6].FindControl("txtComments");

grdRequestResponse.Rows[i].Cells[0].Text = Convert.ToString(i + 1);


if (lblItem.Text != string.Empty)
{
txtItemDescription.Visible = false;
lblItem.Text = dt.Rows[i]["Col1"].ToString();
}
else
{
txtItemDescription.Text = dt.Rows[i]["Col1"].ToString();
}
if (dt.Rows[i]["Col2"] != null) ddlItemAssignedto.SelectedValue = dt.Rows[i]["Col2"].ToString();
if (dt.Rows[i]["Col3"] != null) txtDateCompleted.Text = dt.Rows[i]["Col3"].ToString();
if (dt.Rows[i]["Col4"] != null) rdbListCompletedasPlanned.SelectedValue = dt.Rows[i]["Col4"].ToString();
if (dt.Rows[i]["Col5"] != null) lblSignature.Text = dt.Rows[i]["Col5"].ToString();
if (dt.Rows[i]["Col6"] != null) txtComments.Text = dt.Rows[i]["Col6"].ToString();
rowIndex++;
}
}

}
}


And Im facing a proble that....on first row click it is binding value...
but in second row while im clicking "Notify" button first label is converting as an text box....
I want to bind the textbox value to lable ever if I Click button