Imports System Partial Class Default4 Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load For i As Integer = 0 To GridView1.Rows.Count - 1 Dim iCheckbox As CheckBox = CType(GridView1.Rows(i).FindControl("Checkbox1"), CheckBox) iCheckbox.Checked = False Next End Sub End Class