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Export data from Gridview to an Excel file using C# and LINQ

Posted on 2008-10-22
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Last Modified: 2013-11-11
I devoleping web application in asp.net 2.0 and LINQ, I nedd to Export large data from Gridviewto an Excel file using C#.
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Question by:enrique_aeo
3 Comments
 
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novynov earned 600 total points
ID: 22782716
I may need some clarification on exactly what help you need, but given what you've said, here's how I'd tackle it, assuming that you just need to get the data into excel - you are not looking at preserving the formatting of the gridview in the excel version:

- Presumably, your gridview is getting populated through the results of a LINQ query, either through a LinqDataSource, or a manual DataBind() against the query.
- However your query is getting processed, you have access to it in your code behind, and could execute it on a button click for export (or similar). That way, you are processing the raw data...not parsing through the html formatted table that makes up the rendered gridview
- You could then take the query and iterate it, open a file, and for each row of data, you could write a line into the file, separating each column value with a comma...and then of course close your file. This would produce a CSV file which will open nicely in Excel.

Since I don't have your schema or query at hand, my code snippet is from a test db that I have.

Is this what you need, or are you looking for something else, more detail?
 try
 {
     using (TestDataContext context = new TestDataContext() )
     {             
         using (StreamWriter sw = new StreamWriter(@"c:\temp\persons.csv"))                
         {
 
             foreach (person p in context.persons.OrderBy(p => p.lastname) )                
             {
                 string line = String.Format("{0},{1},{2}", p.pid, p.firstname,p.lastname);
                 sw.WriteLine(line);                    
             }               
         }
                               
     }
 
}
catch (Exception exc)
{
    MessageBox.Show(exc.Message);
 
 
}

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LVL 6

Assisted Solution

by:M3mph15
M3mph15 earned 150 total points
ID: 22782966
Ok here is a function i used:

private void ExportToExcel(string strFileName, GridView gv)
{
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/vnd.ms-excel";
// Tells website that what is going to be outputted can be handled by Excel
Response.AddHeader("content-disposition", "attachment;filename=" + strFileName);
//Set filename
Response.Charset = "";
this.EnableViewState = false;
System.IO.StringWriter sw = new StringWriter();
System.Web.UI.HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
}
 
Basically you pass in a file name and the gridview into this function. You will also need to override the VerifyRederingInServerForm function by placing this in your code behind.


public override void VerifyRenderingInServerForm(Control control)
{
return;
}
In addition to this you may need to disable event Validation for this page by placing the following line in the page directive. EnableEventValidation = "false" so it'll look like this:

<%@ Page Language="C#" EnableEventValidation = "false" AutoEventWireup="true"
 CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>

and that should cause a popup to say wether you want to just open or save the excel spreadsheet.

-M3mph15
0
 

Author Comment

by:enrique_aeo
ID: 22796249
Hello novynov and M3mph15, this interesting code that you provide to me, I review at night it, thanks for your time. Greetings
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