我再次在检查 DataReader 对象是否有数据时遇到问题?
Dim cmd as SqlCommand
Dim drd as SqlDataReader
cmd = New SqlCommand ("SELECT * FROM Stock", conx)
drd = cmd.ExecuteReader()
''HERE I WOULD LIKE TO CHECK WHETHER drd has Data or not
While (drd.Read())
{
txtName.Text = drd.Item("StockName")
}
我该如何检查?请帮我!预先感谢!