I have one c# web application that keeps generating errors in the designer.cs file after I edit an aspx page. I have built multiple web application projects and have not experienced this problem in any others. At this point, I'm deciding that I'm blind to whatever is causing this and hoping someone else will know what is causing the problem.

I have a web app project, we'll call the Default namespace Company.Web.UI.

The project is using master pages.

namespace  Company.Web.UI
{
public partial class MasterPages_default

The content pages reference the master page.

 Hi,

 try to remove all namespace Company.Web.UI 

 I think web pages don't need to use namespace.

Hi,

There is new modifier "Partial" in ASP.NET 2.0.  When we create new page in Visual Studio, it creates two partial classes for this page, one is for developer to write his own code; another is for declare code of control.

In your case, we need to make sure these classes have same Namespace, supported interfaces, and so on.

For more information, see http://webproject.scottgu.com/CSharp/UnderstandingCodeBehind/UnderstandingCodeBehind.aspx

I look forward to hearing from you.

Thomas:

 Please see my "code" above. The namespaces are the same in all .cs files (master.cs, designer.cs, etc.).

Hi,

Thanks for your response. This is Namespace issue. If the classes are in the same Namespace, we don't need to use full qualifier to refer it.

I cannot repro the issue. The following is my test code:

MasterPages_default.Master.cs:

namespace Company.Web.UI
{
    public partial class MasterPages_default : System.Web.UI.MasterPage
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }
}

MasterPages_default.Master.designer.cs:

namespace Company.Web.UI {
   
   
    public partial class MasterPages_default {
       
        /// <summary>
        /// head control.
        /// </summary>
        /// <remarks>
        /// Auto-generated field.
        /// To modify move field declaration from designer file to code-behind file.
        /// </remarks>
        protected global::System.Web.UI.WebControls.ContentPlaceHolder head;
       
        /// <summary>
        /// form1 control.
        /// </summary>
        /// <remarks>
        /// Auto-generated field.
        /// To modify move field declaration from designer file to code-behind file.
        /// </remarks>
        protected global::System.Web.UI.HtmlControls.HtmlForm form1;
       
        /// <summary>
        /// ContentPlaceHolder1 control.
        /// </summary>
        /// <remarks>
        /// Auto-generated field.
        /// To modify move field declaration from designer file to code-behind file.
        /// </remarks>
        protected global::System.Web.UI.WebControls.ContentPlaceHolder ContentPlaceHolder1;
    }
}

MyWebPage.aspx.cs:

namespace Company.Web.UI
{
    public partial class MyWebPage : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        
        }
    }
}

MyWebPage.aspx.designer.cs:

namespace Company.Web.UI
{

    public partial class MyWebPage
    {
        public new Company.Web.UI.MasterPages_default Master
        {
            get
            {
                return ((Company.Web.UI.MasterPages_default)(base.Master));
            }
        }
    }
}

If this cannot help you, please post the code just like me.

I look forward to hearing from you.