使用vb.net基于SQL数据库中存在的记录动态显示/隐藏DataGrid按钮列时出现问题

I am using Visual Studio 2008 and vb.net. I have a datagrid with several columns, the column in question is a ButtonColumn control. Currently buttons appear on every row then link to another page where data is displayed about the name (in another column) is selected. The problem is when the query on the next page doesn't contain data for the selected row the page throws an error.I am using Visual Studio 2008 and vb.net. I hav