I have gridview and dynamic checkboxes in there, when user clicks one of the checkboxes, gridview's that row goes to edit mode and also filters data inside the dropdownlist and populates dropdownlist. I have created oncheckchanged() event handler that if fires when someone clicks the checkbox, but when it is more than one checkbox clicks , after postback doesn't remember the previous values of the other checkbox. What I need to do? I am including commented ones so you can see what I even tried, didn't work.

If Page.IsPostBack Then

'Dim grRow As GridViewRow

'For Each grRow In GridView1.Rows

' Dim ck1 As CheckBox = CType(grRow.FindControl("Chkerr"), CheckBox)

' Dim txtUniqueID As TextBox = CType(grRow.FindControl("txtUniqueID"), TextBox)

' ViewState(txtUniqueID.Text) = ck1.Checked.ToString()

'Next

Else

End If

'Protected Sub GridView1_PreRender(ByVal sender As Object, ByVal e As EventArgs)

' Dim grRow As GridViewRow

' For Each grRow In GridView1.Rows

' Dim chkSelect As CheckBox = CType(grRow.FindControl("Chkerr"), CheckBox)

' Dim txtUniqueID As TextBox = CType(grRow.FindControl("txtUniqueID"), TextBox)

' If chkSelect.Checked = True Then

' Dim bChecked As Boolean = Boolean.Parse(ViewState(txtUniqueID.Text).ToString())

' chkSelect.Checked = bChecked

' End If

' Next

Dim ck1 As CheckBox = CType(sender, CheckBox)

Dim currentrow As Integer = row.RowIndex

' Display the primary key value of the selected row.

If ck1.Checked = True Then

If GridView1.DataKeys(currentrow).Value.ToString() <> 21 Then

Else

'if it is 21 do that.

End If

'if not checked

Else

'if uncheck check box, get out edit mode.

End If

End Sub