How to use Response.Clear() in Windows Application

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C#

Hi Friends,

Can any one suggest me, what are all Namespace and C# coding that we need to use for Response.clear().

I am using Windows Application using C# coding.

Now I am getting the error "The name 'Response' does not exist in the current context", so can any help me fix this error .

The Mentioned Coding that i am Using to download few data's into a file .

Response.Clear();
           Response.Buffer = true;
           Response.AddHeader("content-disposition","attachment;filename=OutPut"+ System.DateTime.Now+ ".csv");
           Response.Charset = "";
           Response.ContentType = "application/text";

Response.Output.Write(dt.ToString());
            Response.Flush();
            Response.End();