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Editorial Team
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Asked: 2026-06-04T06:11:50+00:00

i am getting id from the url and pass it to sqldatasource – selectcommand

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i am getting id from the url and pass it to sqldatasource – selectcommand i get the following error : 

Conversion failed when converting the varchar value '<%=MyIdVal%>'
 to data type int.

code behind : 

Public Partial Class Edit
Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles    Me.Load
    MyIdVal = Request.QueryString("id")
End Sub

Private _myIdVal As Integer

Public Property MyIdVal() As Integer
    Get
        Return _myIdVal
    End Get
    Set(ByVal value As Integer)
        _myIdVal = value
    End Set
End Property

End Class

client : 

 < head runat="server">
<title></title>
  </head>
  <body>
<form id="form1" runat="server">
<div>
<%=MyIdVal%>
</div>
<asp:GridView ID="GridView1" runat="server" DataSourceID="myIdDataSource">
</asp:GridView>
<asp:SqlDataSource runat="server" ID="myIdDataSource" 
    ConnectionString="<%$  ConnectionStrings:myCipConnection  %>" 
    ProviderName="<%$ ConnectionStrings:myCipConnection.ProviderName %>"
    SelectCommand="SELECT * FROM books WHERE id = '<%=MyIdVal%>'" >  

    </asp:SqlDataSource>

</form>
  </body>
  </html>

the code runs fine when i hardcode it
any idea how to fix this error thanks

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1 Answer

  1. Editorial Team

    You cannot use <%= %> syntax in the select command. You have to use a parameter in the query, and add a parameter to the SelectParameters collection of the datasource like:

    <asp:SqlDataSource runat="server" ID="myIdDataSource" 
  ConnectionString="<%$  ConnectionStrings:myCipConnection  %>" 
  ProviderName="<%$ ConnectionStrings:myCipConnection.ProviderName %>"
  SelectCommand="SELECT * FROM books WHERE id = @id">
     <SelectParameters>
         <asp:QueryStringParameter Name="id" Type="Int32" DefaultValue="1" />
     </SelectParameter>
</asp:SqlDataSource>
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