Control does not exists in current context

There are three possible solutions for this error,

1 – There are two classes with same name. Possibly you have renamed a page and created a new one, but you did not changed the name in the cs file. So make sure you have only one file with this name in your project. There may be two files with different name but same class name this may create problems.

2 – Multiple web.config files in your project. Make sure you have only one web.config file in your project. However you can have mulitple web.config files in your project but that has to be in particular format check here.

3 – The designer file is not refreshed.

control does not exists in current context designer file

In this case you have to delete the existing designer file

delete web page designer file

After deleting the file right click on the page, in this case default.aspx and select “Convert to web application”

regenerate designer file - convert page to web application

Once you convert it will prompt for confirmation just select yes

web Page to web application conversion prompt

Once converted you can see the added control declaration in the designer file.

New designer file after converting page to web application

Now you can use the control in your code behind.

Enjoy coding

When you get the above error you can resolve it by the following way, Tools –> Options –> Debugging –> General –> Enable Just my code (Managed only) –> un check "Warn if no user code on launch" 

I encountered this problem in Visual Studio 2008 and like others here, my project settings did not have optimizations enabled and debugging information was configured. My problem turned out to be that the project assemblies stored in the GAC were from an older build. I think when I started debugging, VS tried to map between the GAC assemblies and the new source and could not do so and threw up this message. Deleting my old assemblies from the GAC resolved my issue.

When you get this error in Windows XP make sure you have given ASPNET user sufficient rights on your physical application folder, it mainly requires read permission.

When you get this error in Windows 2003 server you can right click your virtual directory – permission – grant aspnet user sufficient rights there.

If the above solution doesn’t work here is another alternative,

You could try editing the Machine.config (located in
C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\CONFI G\).

Look for a key userName=”machine”. If you set it to “SYSTEM”
instead the aspnet_wp.exe runs with a different user (with
higher privileges).

Hope this helps

1) Create a windows application project with target framework as v2.0

Select Target Framework

2) Create Setup and deployment project and select target framework as v2.0

Target Framework for Setup

3) Right-Click on setup project Name and select Properties, under properties select Prerequisites

Select Prerequistes

4) Check .NET framework 2.0 and uncheck .NET framework 3.5

Select Framework in Prerequisite

5) Under Solution Explorer double click on Microsoft.NET framework under

Setup project.

Select the Framwork to change the version

6) Right-Click on .NET framework select properties and change the version to v2.0…

Change Framework Version

if (Request.UserAgent.IndexOf("AppleWebKit") > 0)
     Request.Browser.Adapters.Clear();

Just add this code on your page load and the menu control will start working fine in Google Chrome as well.

Also some times the hover menus don’t work on IE8 to make it work on IE8 you need to set

“z-index”

in DynamicMenuStyle property of the menu control.

Hope this helps

SharePoint Error: “The language-neutral solution package was not found”

The solution to this problem is, Restart your visual studio. And it will be back to normal.

Hope this helps

Shadow copy is enabled on every appdomain created by ASP.NET by default. By default assemblies loaded will be copied to a shadow copy cache directory, and will be used from that location.

But this may create problem sometimes.

//Import System.IO in your application for StreamWriter Object

//note: excel_file represents the complete physical address of excel file eg  C:/myexcel.xls
public  void export_datagridview_to_excel(DataGridView dgv, string excel_file)
{
int cols;
//open file
StreamWriter wr = new StreamWriter(excel_file);

//determine the number of columns and write columns to file
cols = dgv.Columns.Count;
for (int i = 0; i < cols; i++)
{
wr.Write(dgv.Columns[i].Name.ToString().ToUpper() + “\t”);
}

wr.WriteLine();

//write rows to excel file
for (int i = 0; i < (dgv.Rows.Count - 1); i++)
{
for (int j = 0; j < cols; j++)
{
if (dgv.RowsIdea.Cells[j].Value != null)
wr.Write(dgv.Rows[i].Cells[j].Value + “\t”);
else
{
wr.Write(”\t”);
}
}

wr.WriteLine();
}

//close file
wr.Close();
}

Turn off the custom error mode in web.config file first,

<customErrors mode="Off">

And add this code in your global.asax file to catch the error,

void Application_Error(object sender, EventArgs e)
 {
 HttpContext context = ((HttpApplication)sender).Context;
 if (context.Error != null)
 {
 Exception ex = context.Error;
 string msg = string.Empty;

 while (ex != null)
 {
 if (!string.IsNullOrEmpty(ex.Message))
 msg += ex.ToString() + "<br /><br />";
 ex = ex.InnerException;
 }
 context.Response.Clear();
 context.Response.Write(msg);
 context.Response.End();
 }
 } 

Hope this helps