TextBox value doesn't get updated in a DataGrid control

[Tuomo]

Hi!

I have a form (System.Web.UI.Page) that contains a DataGrid control and a
DataTable that contains values for the data grid and that is data bound to
the DataGrid. When I switch the grid to edit mode (e.g. if I set
DataGrid.EditItemIndex = 0) the values in the data table are displayed
correctly in TextBox controls in the DataGrid at the first time. Then, if I
cause a postback (e.g. by pressing a button) and I set a new value into a
certain data table data field (e.g. in the Page_Load method) the TextBox
contains the old value although the data table field where the text box in
data bound contains a new value.

Why doesn't the TextBox control get updated to a new value?

I have tested that other controls such as Labels, show the current value of
the data table field but I don't understand why TextBox doesn't get the
current value of the data table field.

Thank you.

BR, Tuomo