Question

vb 两个文本框 一个按钮，实现以下功能

即： 当任意一个文本框为空时，按钮隐藏，两个文本框同时有内容时，按钮显示。

谢谢高手

Answer 1

Private Sub Text1_Change()
If Text1.Text = "" Or Text2.Text = ""坦告如肢 Then
Command1.Visible = False
Else: Command1.Visible = True
End If

End Sub

Private Sub Text2_Change()
If Text1.Text = "让橡明" Or Text2.Text = "" Then
Command1.Visible = False
Else: Command1.Visible = True
End If

End Sub

Answer 2

VS2010 VB.NET已测试通过：
Private Sub form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Button1.Visible = False
End Sub

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
If TextBox1.Text = "" Or TextBox2.Text = "" Then
Button1.Visible = False
Else : Button1.Visible = True
End If
End Sub

Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
If TextBox2.Text = "" Or TextBox2.Text = "" Then
Button1.Visible = False
Else : Button1.Visible = True
End If
End Sub