[我的ASP.net学习历程]Try错误信息处理

<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<script language="C#" runat="server">

void Page_Load()
{
string DB_path = @"Data/db.mdb"; //把路径更改可看到错误信息
string DB = Server.MapPath(DB_path);
string strSQL = "SELECT * FROM admin";
string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DB;

System.Data.OleDb.OleDbDataReader dr;
System.Data.OleDb.OleDbConnection conn = null;
System.Data.OleDb.OleDbCommand cmd = null;

//=======================================================
try
{
conn = new System.Data.OleDb.OleDbConnection(connString);
cmd = new System.Data.OleDb.OleDbCommand(strSQL,conn);
cmd.Connection.Open();
}
catch (Exception ex)
{
conn.Close();
Response.Write("Connection was closed!<br>" + ex.Message);
return;
}
//=======================================================

dr = cmd.ExecuteReader();
DataGrid1.DataSource = dr;
DataGrid1.DataBind();
conn.Close();

}

</script>

<asp:datagrid ID="DataGrid1" runat="server"></asp:datagrid>