Error exporting datagridview to Excel

Question

Hello all , i need help with a code that export datagridview to excel

So my problem is that when i click in the export button it just show the columns name and not the data that is on the datagridview.

Here is my code

public static void ExportDataGridViewTo_Excel12(DataGridView itemDataGridView)

        {

            Excel_12.Application oExcel_12 = null;                //Excel_12 Application

            Excel_12.Workbook oBook = null;                       // Excel_12 Workbook

            Excel_12.Sheets oSheetsColl = null;                   // Excel_12 Worksheets collection

            Excel_12.Worksheet oSheet = null;                     // Excel_12 Worksheet

            Excel_12.Range oRange = null;                         // Cell or Range in worksheet

            Object oMissing = System.Reflection.Missing.Value;

            // Create an instance of Excel_12.

            oExcel_12 = new Excel_12.Application();

            // Make Excel_12 visible to the user.

            oExcel_12.Visible = true;

            // Set the UserControl property so Excel_12 won't shut down.

            oExcel_12.UserControl = true;

            // System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("en-US");

            // Add a workbook.

            oBook = oExcel_12.Workbooks.Add(oMissing);

            // Get worksheets collection 

            oSheetsColl = oExcel_12.Worksheets;

            // Get Worksheet "Sheet1"

            oSheet = (Excel_12.Worksheet)oSheetsColl.get_Item(1);

            // Export titles

            for (int j = 0; j < itemDataGridView.Columns.Count; j++)

            {

                oRange = oSheet.Cells[1, j + 1] as Excel_12.Range;

                oRange.Value2 = itemDataGridView.Columns[j].HeaderText;

            }

            // Export data

            for (int i = 0; i < itemDataGridView.Rows.Count - 1; i++)

            {

                for (int j = 0; j < itemDataGridView.Columns.Count; j++)

                {

                    oRange = oSheet.Cells[i + 2, j + 1] as Excel_12.Range;

                    oRange.Value2 = itemDataGridView.Rows[i].Cells[j].Value;

                }

            }

            // Release the variables.

            //oBook.Close(false, oMissing, oMissing);

            oBook = null;

            //oExcel_12.Quit();

            oExcel_12 = null;

            // Collect garbage.

            GC.Collect();

        }