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Editorial Team
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Asked: 2026-05-17T17:23:56+00:00

I have an ASCX that contains <my:Foo ID=Bar runat=server Value=” /> I want to

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I have an ASCX that contains

<my:Foo ID="Bar" runat="server" Value='' />

I want to set Value with textbox1.Text, but Value is an Int32. I am looking for something like this:

<my:Foo ID="Bar" runat="server" Value='<%= Int32.Parse(textbox1.Text) %>' />

But I get

Parser Error Message: Cannot create an object of type 'System.Int32' from its string representation '<%= Int32.Parse(textbox1.Text) %>' for the 'Value' property.

Is there a way to do this on the ASCX file? Do I have to implement a TypeConverter for this property?

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1 Answer

  1. Editorial Team

    I don’t understand why you can’t simply use the literal instead of a string representation:

    <my:Foo ID="Bar" runat="server" Value="58" />

    If you want to set this value dynamically, you will need to do so in the code behind or within a code block, for example in the page load event handle, as you cannot use code blocks (<%%>) within a server side control:

    // code behind, in the page_load event handler
Bar.Value = 58;

    Or, within the ascx, outside of server side controls:

    <% Bar.Value = 58; %>
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