Save the data output in the control to local Excel or Word, while saving the picture to local (C #)

excel|word| Control | data//SAVE data in a table control to Excel or Word
public void Save (System.Web.UI.Control source, DocumentType type)

{
Response.Clear ();
Response.buffer= true;

Set HTTP header information, encoding format
if (type = = Documenttype.excel)
{
Excel
Response.appendheader ("Content-disposition", "Attachment;filename=result.xls");
Response.ContentType = "Application/ms-excel";
}
else if (type = = Documenttype.word)
{
Word
Response.appendheader ("Content-disposition", "Attachment;filename=result.doc");
Response.ContentType = "Application/ms-word";
}

Set encoding
Response.charset= "GB2312";
Response.contentencoding=system.text.encoding.getencoding ("GB2312");

To close the view state of a control
Source. EnableViewState =false;

Initialize HTMLWriter
System.IO.StringWriter writer = new System.IO.StringWriter ();
System.Web.UI.HtmlTextWriter HTMLWriter = new System.Web.UI.HtmlTextWriter (writer);
Source. RenderControl (HTMLWriter);

Output
Response.Write (writer. ToString ());

Response.End ();
}


Here is the Save picture
public void Savepic ()
{
String path = Server.MapPath (".") + @ "\images\chart.jpeg";
FileStream file = file.openread (path);
byte[] content = new Byte[file. Length];
File. Read (content,0,content. Length);
File. Close ();

Response.Clear ();
Response.appendheader ("Content-disposition", "attachment;filename=chart.jpeg");
Response.ContentType = "Image/jpeg";//Set HTTP header information
Response.BinaryWrite (content);//Output

Response.End ();
}

However, after the picture is saved, the DropDownList select event on the page can not promote, do not know what is the cause, and the button event on the page can inspire events, do not know if we have not seen this problem? Can I talk about it, or is there a problem with the process of saving my pictures?