How to save created excel file to Client pc in ASP.NET

Question

I am creating a excel report and html report in asp.net when I clik the button and my application create it and save to the client desktop but, it is not working correctly becau

Answer 1

One important thing to note so that the selected best answer works for you:
You have to use to use a different library than the Microsoft.Office.Interop.Excel implied in the question. You have to use EPPlus. This is how you set it up in your project:

1. From Visual Studio's Package Manager Console, type: Install-Package EPPlus (this will install the library and the reference as needed)
2. Add this using statement (using OfficeOpenXml;)

And this is some sample code to create the excel package (pck) as referred to in the best answer:

    ExcelPackage pck = new ExcelPackage();
    ExcelWorksheet ws = pck.Workbook.Worksheets.Add("exported data");
    // Excel sheet headings
    ws.Cells[1, 1].Value = "Column 1 title";
    ws.Cells[1, 2].Value = "Column 2 title";

Now you can use the code provided in the best answer.

Answer 2

You need to send the file to client using Response object. To ignore the warning message like when client is opening the excel file -

To prevent this you need to mention the content type and length in the response use the sample code

//Read the Excel file in a byte array. here pck is the Excelworkbook              
Byte[] fileBytes = pck.GetAsByteArray();

//Clear the response               
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.Cookies.Clear();
//Add the header & other information      
Response.Cache.SetCacheability(HttpCacheability.Private);
Response.CacheControl = "private";
Response.Charset = System.Text.UTF8Encoding.UTF8.WebName;
Response.ContentEncoding = System.Text.UTF8Encoding.UTF8;
Response.AppendHeader("Content-Length", fileBytes.Length.ToString());
Response.AppendHeader("Pragma", "cache");
Response.AppendHeader("Expires", "60");
Response.AppendHeader("Content-Disposition",
"attachment; " +
"filename=\"ExcelReport.xlsx\"; " +
"size=" + fileBytes.Length.ToString() + "; " +
"creation-date=" + DateTime.Now.ToString("R") + "; " +
"modification-date=" + DateTime.Now.ToString("R") + "; " +
"read-date=" + DateTime.Now.ToString("R"));
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
//Write it back to the client    
Response.BinaryWrite(fileBytes);
Response.End();

Answer 3

You can write excel file to response HttpResponse.WriteFile Method

string CurrentDate;
DateTime saveNow = DateTime.Now;
CurrentDate = saveNow.Date.ToShortDateString();
string reportContent = prepareHTM();

string pathFile = Environment.GetFolderPath(Environment.SpecialFolder.CommonDesktopDirectory) + "\\As_Build_Report_ "+ CurrentDate + ".html";

using (StreamWriter outfile = new StreamWriter(pathFile, true))
{
    outfile.WriteLine(reportContent);
}

System.IO.FileInfo file = new System.IO.FileInfo(pathFile); 
Response.Clear(); 
Response.Charset="UTF-8"; 
Response.ContentEncoding=System.Text.Encoding.UTF8; 
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name); 
Response.AddHeader("Content-Length", file.Length.ToString());    
Response.ContentType = "application/ms-excel";  
Response.WriteFile(file.FullName); 
Response.End(); 

Answer 4

You can not directly save it to a specific clientside location. What you can do is returning the file with that request so that on the browser side a "save file" dialog pops up.