请问兄弟们protected global_asax ApplicationInstance 出现错误,如何解决

[brightfran]

using System;
using System.Web.Profile;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
public class Controls_MessageShow : UserControl
{
protected Image Image2;
protected ImageButton LBOK;
protected Literal Literal1;
protected Literal Literal2;
protected HtmlTable Table1;

public Controls_MessageShow();
protected global_asax ApplicationInstance { get; }

public string Message { set; }
protected DefaultProfile Profile { get; }

protected void Page_Load(object sender, EventArgs e);
public void SetErrorType(Controls_MessageShow.ErrorType et);
public void SetUrl(string url);

public enum ErrorType
{
Admonition = 0,
Error = 1,
SystemError = 2,
Information = 3,
UnknowError = 4,
}
}

[brightfran]

protected global_asax ApplicationInstance { get; }出现错误需要引用哪个类

[wuyq11]

检查是否命名重复

[wuyq11]

删除临时文件，有没有.App_global.asax.dll