数据库等等 都能连通了  
  selectString = "select 用户名　from table_2 where 用户ID=2"

            Dim myConnection As New SqlClient.SqlConnection


            myConnection.ConnectionString = conn
            Dim myCommand As New SqlClient.SqlCommand(selectString, myConnection)

            myConnection.Open()
            

            Dim read As SqlClient.SqlDataReader
            read = myCommand.ExecuteReader
            TextBox1.Text = ？？？？？？
  这条查询语句返回的值  要在TextBox1.Text  中显示  ？？？？处  read这个对象应该怎么写？