Systemexception how to handle this error on your MVC?

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I am developing an MVC application to allow user to register/create and login. On my view folder, under ViewStart.cshtml there is an execption below and dont know how to fix this please assist mates "Value cannot be null, parameter name- virtualPath".

What I have tried:

C#

<pre>@{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["Controller"].ToString();

    string layout = "";
    if(controller == "Admin")
    {
        Layout = "~/Views/Shared/_Layout.cshtml";

    }else
    {
         Layout = "~/Views/Shared/_MainLayout.cshtml";
    }
    Layout = layout;
 
}

Posted 20-Jan-20 21:06pm

gcogco10

Updated 20-Jan-20 21:47pm

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TheRealSteveJudge · Accepted Answer · 2020-01-20T21:48:00

If you debug your code you will find out that you set Layout depending on the controller configuration.
So far so good.
Then you replace Layout with layout which was set to an empty string before.
Please try this:

@{
    var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["Controller"].ToString();

    if(controller == "Admin")
    {
        Layout = "~/Views/Shared/_Layout.cshtml";

    }else
    {
        Layout = "~/Views/Shared/_Layout.cshtml";
    }
}