Postback Lose Value From Dynamically Created Textbox Gridview?

Aug 25, 2010

I dynamically create gridview, and in this grid I have template field also

field.HeaderTemplate = New GridViewTemplate(ListItemType.Header, col.ColumnName)
field.ItemTemplate = New GridViewTemplate(ListItemType.Item, col.ColumnName)
grdEmpty.Columns.Add(bfield)

but when enter some value in text box in this template field i lose value on postback. And also on postback I lose all template field and i must re-create this grid.

My goal is: I have button and i want to add new row in this grid, but i want to have old value also.

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
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