Develop Reference

The file format and extension dont match when using closexml?

I have a working method, that export to excel, but the issue is file extension is not support and being not format. This is not user friendly, how can I improve this from not allow a user to see this issue?
// controller
public void ExportToExcel()
{
var v = new GridView();
v.DataSource = this.GetExtractionViewModels();
v.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=ExtractionRecords.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter objStringWriter = new StringWriter();
HtmlTextWriter htmlTextWriter = new HtmlTextWriter(objStringWriter);
v.RenderControl(htmlTextWriter);
Response.Output.Write(objStringWriter.ToString());
Response.Flush();
Response.End();
//return View("DataResult");
}

Excel file export nothing happens with no error

I have trying to export my data from my data access layer
but nothing happens no error and not exported.
it is kinda hard to know whats wrong because there's no error
I have tried this:
if (dt.Rows.Count > 0){
dgv.DataSource = dt;
dgv.DataBind();
Response.ClearContent();
Response.AppendHeader("content-disposition","attachement;filename=transaction.xls");
Response.ContentType = "application/excel";
StringWriter stringWritter = new StringWriter();
HtmlTextWriter htmlTextWritter = new HtmlTextWriter(stringWritter);
dgv.RenderControl(htmlTextWritter);
Response.Write(stringWritter.ToString());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.SuppressContent = true;
HttpContext.Current.ApplicationInstance.CompleteRequest();
butnothing happens.
i have tried this but also nothing:
StringWriter osStringWritter = new StringWriter();
Html32TextWriter osHtmlTextWritter = new Html32TextWriter(osStringWritter);
DataTable dt = new DataTable();
DataGrid dgv = new DataGrid();
Response.Clear();
Response.Buffer = false;
Response.ContentType = "application/vnd.ms-excel";
Response.AddHeader("content-disposition", string.Format("attachment;filename={0}.xls", "TransactionReport"));
Response.Charset = "";
dgv.DataSource = dt;
dgv.DataBind();
dgv.RenderControl(osHtmlTextWritter);
Response.Write("Report Datw:" + DateTime.Now);
Response.Write(osStringWritter.ToString());
//Response.End();
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.SuppressContent = true;
HttpContext.Current.ApplicationInstance.CompleteRequest();
dgv = null;
osStringWritter = null;
osHtmlTextWritter = null;
What i'm doing wrong ?

Try this may resolve your issue
dgv.DataSource = dt;
dgv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename = Export to Excel.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
dgv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
}

export two gridview in two different excel

I have to export two gridview in two different excel,
but while exporting i getting exception on Respose.end() of first gridview (System.Threading.ThreadAbortException).
{//export firstgrid
Response.ClearContent();
Response.ClearHeaders();
DataTable dtGetReportBank = new DataTable();
dtGetReportBank = objPO.GetReportBank(id);
gridData1.DataSource = dtGetReportBank;
gridData1.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "BankCMS" + ".xls"));
Response.ContentType = "application/ms-excel";
StringWriter sw1 = new StringWriter();
HtmlTextWriter htw1 = new HtmlTextWriter(sw1);
gridData1.AllowPaging = false;
dvContent.RenderControl(htw1);
Response.Write(sw1.ToString());
Response.End();
Btn.Visible = false;
}
//export second grid
{
Response.ClearContent();
Response.ClearHeaders();
DataTable dtGetReportBank = new DataTable();
dtGetReportBank = objPO.GetReportBank(id);
gridData.DataSource = dtGetReportBank;
gridData.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "BankCMS" + ".xls"));
Response.ContentType = "application/ms-excel";
StringWriter sw1 = new StringWriter();
HtmlTextWriter htw1 = new HtmlTextWriter(sw1);
gridData.AllowPaging = false;
dvContent.RenderControl(htw1);
Response.Write(sw1.ToString());
Response.End();
Btn.Visible = false;
}

export large list<> to excel C# MVC

I want to export a list with over 10000 rows to excel using MVC5 C#.
when I export using DataGrid some columns are not shown in the excel file - 3 columns are disapeard in the excel file but all the 10000 rows appeard.
string filename = Guid.NewGuid() + ".xls";
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
DataGrid dgGrid = new DataGrid();
List registrationsetList = db.RegistrationSet.Where(x => x.QuestionId == TheQuestion.Id).ToList();
dgGrid.DataSource = registrationsetList;
dgGrid.DataBind();
dgGrid.RenderControl(hw);
Response.BinaryWrite(System.Text.Encoding.UTF8.GetPreamble());
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
Response.Write(tw.ToString());
Response.End();
If I change DataGrid dgGrid = new DataGrid()
to GridView dgGrid = new GridView();
with list of 600 of rows, the excel looks perfect with all the columns.
the problem is when i export all the list of 10000 rows, the excel file got stuck - i got not responding message.
why ?

Instead of using a DataGrid() try using a WebControl GridView():
string filename = Guid.NewGuid() + ".xls";
var gv = new System.Web.UI.WebControls.GridView();
var registrationsetList = db.RegistrationSet.Where(x => x.QuestionId == TheQuestion.Id);
g.DataSource = registrationsetList;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=" + filename);
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWiter sw = new StringWriter();
var htw = new System.Web.UI.HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();

The problem (with that stucked excel file) was solved with DataGrid. The problem was that the DateGrid doen't show columns of nullable fields in the CLASS in the list that i bound to the GridView.

Export to Excel not working in ASP.NET MVC 4

I have a code that will generate an excel report.i am using ASP.NET MVC 4. I googled and found the same code everywhere still my code is not working why. My code in controller is as:
public ActionResult ExportData()
{
string[] abc = { "AAA", "BBB", "CCC" };
GridView gv = new GridView();
gv.DataSource = abc;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=Marklist.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
return RedirectToAction("_EligibilityCriteria");
}
Just to test the export functionality I used an array abc this code is working in .net application but not in ASP.NET MVC 4 application. I have debugged the code but not found a problem or error in code.
What am I doing wrong here?

Finally found a way to export to excel.
public void ExportIniEmployeeToExcel(EligibilityCriteriaModel AllIniEmp)
{
List<AllIniEmployees> emp = new List<AllIniEmployees>();
AllIniEmp.allSuccessEmployeeList.ForEach(x =>
{
AllIniEmployees allEmp = new AllIniEmployees();
allEmp.EmployeeCode = x.EmployeeCode;
allEmp.EmployeeName = x.EmployeeName;
allEmp.Designation = x.Designation;
allEmp.DeliveryTeam = x.DeliveryTeam;
allEmp.ConfirmationDate = x.ConfirmationDate;
emp.Add(allEmp);
});
GridView gv = new GridView();
gv.DataSource = emp;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=InitiatedEmployees.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
here i used parent class as a parameter and used linq.now its working perfectly fine.
thank you all.

You can't just write the output with a StringWriter. After your call to RenderControl, write:
byte[] byteArray = Encoding.ASCII.GetBytes(sw.ToString());
MemoryStream s = new MemoryStream(byteArray);
StreamReader sr = new StreamReader(s, Encoding.ASCII);
Response.Write(sr.ReadToEnd());
Response.End();

Try returning a ContentResult instead of writing directly to the output stream.