2
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
conn.Open()
cmd.Connection = conn
cmd.CommandText = "Select RoomName from Room_Details"
dr = cmd.ExecuteReader
While dr.Read
ComboBox3.Items.Add(ComboBox2.SelectedItem(dr("RoomName")))
ComboBox2.Items.Remove(ComboBox2.SelectedItem(dr("RoomName")))
End While
conn.Close()
End Sub
我试试这个代码,但它引发以下错误:如何解决此代码中的“对象变量或块变量未设置”?
Object variable or with block variable not set
如何提高我的代码,以解决这一问题?
当使用调试器时,你在哪一行看到异常? – 2012-01-31 04:38:49
@Jay Riggs,tsk tsk,现在玩起来不错 - ) – 2012-01-31 04:42:41
@astander我知道,这就是为什么我删除了我无用的评论! :) – 2012-01-31 04:43:49