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Editorial Team
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Asked: 2026-05-21T16:27:16+00:00

I am seeing this error: Unable to cast object of type ‘System.Web.Profile.DefaultProfile’ to type

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I am seeing this error:

Unable to cast object of type ‘System.Web.Profile.DefaultProfile’ to type ‘ProfileCommon’.

on following code:

ProfileCommon p = (ProfileCommon)ProfileCommon.Create(TextUsername.Text, true);

I am not sure why…

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1 Answer

  1. Editorial Team

    Agree with theChrisKent.It’s look like problem in the web.config

    Check out the following example for,How to get ProfileCommon object in asp.net

    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="GetProfile" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        User Name:<asp:TextBox ID="txtUserName" runat="server"/>
        <asp:Button ID="cmdGet" runat="server" OnClick="cmdGet_Click" Text="Get Profile" /><br />
        <asp:Label ID="lbl" runat="server" Text=""/>
    </div>
    </form>
</body>
</html>

    File: Default.aspx.cs

    using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class GetProfile : System.Web.UI.Page
{
  protected void cmdGet_Click(object sender, EventArgs e)
  {
    ProfileCommon profile = Profile.GetProfile(txtUserName.Text);
        if (profile.LastUpdatedDate == DateTime.MinValue)
        {
            lbl.Text = "No user match found.";
        }
        else
        {
            lbl.Text = "This user lives in " + profile.FirstName;
        }
  }
}

    File: Web.config

    <?xml version="1.0"?>
<configuration>
  <system.web>
    <profile>
      <properties>
        <add name="FirstName" type="String" serializeAs="Binary"/>
        <add name="LastName" type="String" serializeAs="Xml"/>
        <add name="DateOfBirth" type="DateTime" serializeAs="String"/>
      </properties>
    </profile>
  </system.web>
</configuration>

    EDIT

    This example only work when the project type is website.If you want to use ProfileCommon object in Web Application then go through the following link

    Converting Profile Object Code

    EDIT -II

    As per your comment,Following link might help you

    ASP.NET Profiles in Web Application Projects

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