Материал из .Net Framework эксперт
Catch database operation exceptions for data binding
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.Oledb" %>
<script language="vb" runat="server">
Sub Page_Load()
Dim strConnection as String = "Provider=Microsoft.Jet.OLEDB.4.0;"
strConnection += "Data Source=C:\Northwind.mdb"
data_src.text = strConnection
Dim strSQL as string = "SELECT FirstName, MiddleName, LastName FROM Employees;"
Dim objDataSet as new DataSet()
Dim objConnection as new OledbConnection(strConnection)
Dim objAdapter as new OledbDataAdapter(strSQL, objConnection)
Try
objAdapter.Fill(objDataSet, "Employees")
Dim objDataView as New DataView(objDataSet.Tables("Employees"))
dgNameList.DataSource=objDataView
dgNameList.DataBind()
Catch objError as OledbException
If Left(objError.Message,21)="Login failed for user" Then
divErrorReport.InnerHTML = "Problem with Log-in"
ElseIf Left(objError.Message,19)="Could not find file" Then
divErrorReport.InnerHTML = "We could not find the MDB file that you asked for"
Else
divErrorReport.InnerHTML = "<br />message - " & objError.Message
divErrorReport.InnerHTML += "<br />source - " & objError.Source
End If
End Try
end Sub
</script>
<html>
<body>
<h4>Writing data from the connection
<asp:label id="data_src" runat="server"/>
to the DataGrid control with error checking.</h4>
<div id="divErrorReport" runat="server"> </div>
<asp:datagrid id="dgNameList" runat="server" /><br />
</body>
</html>
