[VB.NET]asp.net vb.net 菜鸟问题~~~求助

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asp.net vb.net 菜鸟问题~~~求助
aspx页面 建立一个按钮 一个GridView1
功能：点击 按钮 GridView1显示MT_USER 内容

双击按钮----vb.net内编辑

Dim conn As New SqlConnection
Dim sda As SqlDataAdapter
Dim ds As New DataSet
Dim sql = "select * from MT_USER "

conn.ConnectionString = "server=localhost;database=aaa;uid=sa;pwd=sa "
sda = New SqlDataAdapter(sql, conn)
sda.Fill(ds)

GridView1.DataSource = ds.Tables(0)

运行后~~~点击按钮 没有反应。。。求助。。。
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- -~
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一步一步执行，看看是哪一步出了问题再解决
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绑定数据修改下；
增加Try
...

catch ex as exception
....
end try
看看语句是否有错误
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conn.ConnectionString = "server=localhost;database=aaa;uid=sa;pwd=sa "

后加上

conn.Open()
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后加上

conn.Open()

也是没反应

加上try catch后 也是没反应。。。。迷糊了。。
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没有报错信息,说明没有错误,无须Try..Catch

应该是没有触发GridView1.Databind() 这个事件
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应该怎么做呢？
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GridView1.BindDing()
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