Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer
For i = 1 To Me.TextBox1.Text.ToString.Length
If Asc(Mid(Me.TextBox1.Text.ToString, i, 1)) > 122 Or Asc(Mid(Me.TextBox1.Text.ToString, i, 1)) < 65 Then
Button1.Text = "不是英文" & Mid(Me.TextBox1.Text.ToString, i,1) Exit For
End If
Next
End Sub