使用datatimepicker的问题
form里有两个控件，一个TextBox TextBox1 还有一个DataTimePicker dtp

VB.NET code

' 当焦点离开text时进行检查，看其有没有入力，如果没有入力则报个messaege，并将背景色设成黄色。    Private Sub TextBox1_Validating(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating        TextBox1.BackColor = Colo[code=VB.NET]

r.White
If TextBox1.Text.Length = 0 Then
TextBox1.Select()
TextBox1.BackColor = Color.Yellow
MsgBox("1001")
e.Cancel = True
End If
End Sub[/code]
但是当点那个DatatimePicker的时候，会报两遍错。若是把DatatimePicker换成别的控件如textbox，combobox则都没问题。
请问怎么回事？

[解决办法]

VB.NET code

    Private Sub TextBox1_Validating(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating        If TextBox1.Text.Length = 0 Then            TextBox1.BackColor = Color.Yellow            MsgBox("1001")            e.Cancel = True        End If    End Sub