GridView to Excel using EPPlus - asp.net

Question

I'm trying to create an excel sheet using the EPPlus's library.
However, the output excel file does not relate well to cells of representing numbers.
The code I'm using is:
using (var pck = new ExcelPackage())
{
ExcelWorksheet ws = pck.Workbook.Worksheets.Add(string.IsNullOrEmpty(SpreadsheetName) ? "Report" : SpreadsheetName);
ws.Cells["B2"].LoadFromDataTable(gridViewTable, true, OfficeOpenXml.Table.TableStyles.Light1);
for (int i = 1; i <= gridViewTable.Columns.Count; i++)
{
ws.Column(i).AutoFit();
}
// **************
// HEADER
// **************
//prepare the range for the column headers
string cellRange = "B2:" + Convert.ToChar('B' + gridViewTable.Columns.Count - 1) + 2;
//Format the header for columns
using (ExcelRange rng = ws.Cells[cellRange])
{
rng.Style.WrapText = false;
rng.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
rng.Style.Font.Bold = true;
rng.Style.Fill.PatternType = ExcelFillStyle.Solid; //Set Pattern for the background to Solid
rng.Style.Fill.BackgroundColor.SetColor(ColorTranslator.FromHtml("#007A99"));
rng.Style.Font.Color.SetColor(Color.White);
}
// ************
// DATA
// ************
//prepare the range for the rows
string rowsCellRange = "B3:" + Convert.ToChar('B' + gridViewTable.Columns.Count - 1) + (gridViewTable.Rows.Count + 1);
//Format the rows
using (ExcelRange rng = ws.Cells[rowsCellRange])
{
rng.Style.WrapText = false;
rng.Style.HorizontalAlignment = ExcelHorizontalAlignment.Left;
rng.Style.Fill.PatternType = ExcelFillStyle.Solid; //Set Pattern for the background to Solid
rng.Style.Fill.BackgroundColor.SetColor(ColorTranslator.FromHtml("#B2D1F0"));
rng.Style.Font.Color.SetColor(Color.Black);
}
Response.ClearHeaders();
Response.ClearContent();
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment; filename=" + (string.IsNullOrEmpty(FileName) ? "Report" : FileName) + ".xlsx");
Response.BinaryWrite(pck.GetAsByteArray());
}
Does anyone might know why is this happening ?

Answer 1

I got it.
If you use the LoadFromDataTable() method, the DataTable object should be typed in its columns, meaning that you should create the columns using
table.Columns.Add(columnName, columnType);