'MainForm Button event is no problem, variable a store "1" Private Sub BtnBatch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnBatch.Click Dim a as string ="" a = ComboBoxUsername.text OptionForm.Show() End Sub ----------------------------------------------------------------------------------------------------------------------------------------------- Private Sub OptionForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim b As String = "" b = MainForm.ComboBoxUsername.Text 'My problem in this , b store " " ,no data end sub