Exporting data to excel in vb.net - asp.net

Question

I am unable to export my data into excel.
I have tried the suggestions on S/O, but have not had any luck.
Dim sqlString As String = "spExportRateProfile" & Session("OfficeNumber") & "," & Session("SalesRepID")
Dim conn As SqlConnection = New SqlConnection(Utils.GetConfigKey("ConnectionStringVimas"))
conn.Open()
Dim dt As DataTable = New DataTable()
Dim da As SqlDataAdapter = New SqlDataAdapter(sqlString, conn)
da.Fill(dt)
Response.AddHeader("content-disposition", "attachment;filename=ReportExport.xlsx")
Response.ContentType = "application/vnd.ms-excel"
What do I need do after this to export my data to excel?

Answer 1

You could use a ExcelLibrary like EPPlus(GPL) which i can warmly recommend.
Then it is as easy as this to create Excel-Files from a DataTable and write it to the Response:
Dim pck = New ExcelPackage()
Dim ws = pck.Workbook.Worksheets.Add("Worksheet-Name")
ws.Cells("A1").LoadFromDataTable(dt, True, OfficeOpenXml.Table.TableStyles.Medium1)
Response.Clear()
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
Response.AddHeader("content-disposition", "attachment; filename=ExcelFileName.xlsx")
Response.BinaryWrite(pck.GetAsByteArray())
Here is another example: http://epplus.codeplex.com/wikipage?title=WebapplicationExample

Answer 2

once you have your datatable dt here you should do this (C# - just copied from the Internet)
...
da.Fill(dt);
Response.ContentType = "Application/x-msexcel";
Response.AddHeader("content-disposition", "attachment; filename=\"test.csv\"");
Response.Write((new ExportXMLCSV()).ToCSV(dt));
Response.End();
and here the method ToCSV of the class ExportXMLCSV (C# - just copied from the Internet)
public string ToCSV(DataTable dataTable)
{
//create the stringbuilder that would hold our data
StringBuilder sb = new StringBuilder();
//check if there are columns in our datatable
if (dataTable.Columns.Count != 0)
{
//loop thru each of the columns so that we could build the headers
//for each field in our datatable
foreach (DataColumn column in dataTable.Columns)
{
//append the column name followed by our separator
sb.Append(column.ColumnName + ',');
}
//append a carriage return
sb.Append("\r\n");
//loop thru each row of our datatable
foreach (DataRow row in dataTable.Rows)
{
//loop thru each column in our datatable
foreach (DataColumn column in dataTable.Columns)
{
//get the value for tht row on the specified column
// and append our separator
sb.Append(row[column].ToString() + ',');
}
//append a carriage return
sb.Append("\r\n");
}
}
//return our values
return sb.ToString();
}
everything just copied from here: http://forums.asp.net/t/1115305.aspx you should be good to go with a little exercise of conversion C# -> VB.NET ;-)