[求助]gridview代码连接数据库应该怎么做？

Dim constr As String = "uid=sa;pwd=123;database=infomation;server=W8DJHYLNJCL4ZIW"
Dim con As New SqlConnection(constr)
Dim cmdstr As String = "select id,name,org from detail"
Dim ada As New SqlDataAdapter(cmdstr, con)
Dim ds As New DataSet

con.Open()
ada.Fill(ds, "detail")
GridView1.DataSource = ds.Tables(0)
GridView1.DataBind()

这些代码正确吗？我运行之后，gridview没有显示出来，请问是什么原因？