ASP.NET is not calling C# code

Mark M 2140 08 Dec 2014

For some reason this following ASP code is not calling the c# method "checkLastNames" that is suppose to be evaluated in the 'Visible=' field below.

<asp:Button ID="btnZ" 
            runat="server" 
            Text="Z" 
            Height="20px" 
            Width="25px" 
            Font-Size="12px" 
            CommandArgument="Z" 
            OnClick="btnA_Click" 
            Visible='<%# checkLastNames("Z") %>' />

When I enter debug mode the method isn't even being called. Visible just defaults to true. I've tried changing the method to return only false just to see if it would work but "Visible" is still defaulting to true.

protected bool checkLastNames(string s){
    return false;
}

Mark M

Other

2 Answers

Takeshi Okada 09 Dec 2014

Try like this

<asp:Button ID="btnZ" runat="server" Text="Z" 
           
Height="20px" 
           
Width="25px" 
           
Font-Size="12px" 
           
CommandArgument="Z" 
           
OnClick="btnA_Click" 
           
Visible='<%= checkLastNames("Z") %>' />

Anonymous User 09 Dec 2014

<%# is for databinding expressions, so this works only if the namingcontainer control of this Button is databound.

For example in Page_Load:

this.DataBind();

But why not using codebehind in the first place?

btnZ.Visible = checkLastNames("Z");

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ASP.NET is not calling C# code

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