I am creating textboxes and add in to table(text boxes and tables both are being generated at runtime).Now i need to identify textboxes so that i Could make some calculations.I am unable to identify the textboxes .how can i provide them a unique identity. can some one help me plz it's urgent.

When you create your textboxes, you have to give them an ID or Name to be able to identify them. Then you have to loop through all the controls on the page:

  Private Sub IterateThroughChildren(ByVal parent As Control)
        '''
        Dim c As Control
        For Each c In parent.Controls
          If c.GetType().ToString().Equals("System.Web.UI.WebCo ntrols.TextBox") Then
             Dim tb As TextBox
             tb = CType(c, TextBox)
             '''Here you can grab the values of the textbox and do what you want ...

        Next c

    End Sub 'IterateThroughChildren