Export to Excel using VB.NET

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Introduction

Exporting data to Excel of Microsoft Office is currently needed. But many of them used very complicated coding for simple export either from Datagrid or DataTable. I used simple Dataset to export the data.

Background

Introducing the way of sending data from datagrid or by Datatable. I used Dataset which is easy to use. But for code optimization, dataset is not advisable compared to Reader and DataTable.

Using the Code

Currently, available code for exporting the data to Excel are given which is so complete and not straight forward because they used the Datagrid and DataTable which are given below:

From DataTable to Excel sheet:

Dim dt1 As New DataTable
Dim I1, J1 As Integer
For I1 = 0 To dsmas1.Tables(0).Columns.Count - 1
      dt1.Columns.Add(dsmas1.Tables(0).Columns(I1).ColumnName)
 Next
 For I1 = 0 To dsmas1.Tables(0).Rows.Count - 1
      Dim DR As DataRow = Nothing
      DR = dt1.NewRow
      For J1 = 0 To dsmas1.Tables(0).Columns.Count - 1
          DR.Item(J1) = dsmas1.Tables(0).Rows(I1).ItemArray(J1)
      Next
      dt1.Rows.Add(DR)
 Next
 rel_ds.Tables.Add(dt1)
 Dim dt As New DataTable
 Dim I, J As Integer
 For I = 0 To dschd1.Tables(0).Columns.Count - 1
      dt.Columns.Add(dschd1.Tables(0).Columns(I).ColumnName)
 Next
 For I = 0 To dschd1.Tables(0).Rows.Count - 1
      Dim DR As DataRow = Nothing
      DR = dt.NewRow
      For J = 0 To dschd1.Tables(0).Columns.Count - 1
          DR.Item(J) = dschd1.Tables(0).Rows(I).ItemArray(J)
      Next
      dt.Rows.Add(DR)
 Next
  rel_ds.Tables.Add(dt)

For DataGrid to Excel sheet:

'verfying the datagridview having data or not
If ((DataGridView1.Columns.Count = 0) Or (DataGridView1.Rows.Count = 0)) Then
    Exit Sub
End If

'Creating dataset to export
Dim dset As New DataSet
'add table to dataset
dset.Tables.Add()
'add column to that table
For i As Integer = 0 To DataGridView1.ColumnCount - 1
    dset.Tables(0).Columns.Add(DataGridView1.Columns(i).HeaderText)
Next
'add rows to the table
Dim dr1 As DataRow
For i As Integer = 0 To DataGridView1.RowCount - 1
    dr1 = dset.Tables(0).NewRow
    For j As Integer = 0 To DataGridView1.Columns.Count - 1
        dr1(j) = DataGridView1.Rows(i).Cells(j).Value
    Next
    dset.Tables(0).Rows.Add(dr1)
Next

Dim excel As New Microsoft.Office.Interop.Excel.ApplicationClass
Dim wBook As Microsoft.Office.Interop.Excel.Workbook
Dim wSheet As Microsoft.Office.Interop.Excel.Worksheet

wBook = excel.Workbooks.Add()
wSheet = wBook.ActiveSheet()

Dim dt As System.Data.DataTable = dset.Tables(0)
Dim dc As System.Data.DataColumn
Dim dr As System.Data.DataRow
Dim colIndex As Integer = 0
Dim rowIndex As Integer = 0

For Each dc In dt.Columns
    colIndex = colIndex + 1
    excel.Cells(1, colIndex) = dc.ColumnName
Next

For Each dr In dt.Rows
    rowIndex = rowIndex + 1
    colIndex = 0
    For Each dc In dt.Columns
        colIndex = colIndex + 1
        excel.Cells(rowIndex + 1, colIndex) = dr(dc.ColumnName)

    Next
Next

wSheet.Columns.AutoFit()
Dim strFileName As String = "D:\ss.xls"
Dim blnFileOpen As Boolean = False
Try
    Dim fileTemp As System.IO.FileStream = System.IO.File.OpenWrite(strFileName)
    fileTemp.Close()
Catch ex As Exception
    blnFileOpen = False
End Try

If System.IO.File.Exists(strFileName) Then
    System.IO.File.Delete(strFileName)
End If

wBook.SaveAs(strFileName)
excel.Workbooks.Open(strFileName)
excel.Visible = True

But I used only Dataset to Excel sheet.

In code, I used a user defined function called "Load_Excel_Details()" in which I used an old technique like create Object for Excel, add the Book for a sheet and sheet for the data.

i.e,.

• Excel <-- System.Runtime.InteropServices.Marshal.ReleaseComObject(Excel)
  • Book <------ Excel Workbooks.Add()
    • Sheet <----- Excel SheetsInNewWorkbook = 1
      • Data <----- Excel cells(1, i).value

which is used in the code like given below:

 With Excel
       .SheetsInNewWorkbook = 1
       .Workbooks.Add()
       .Worksheets(1).Select()

      Dim i As Integer = 1
      For col = 0 To ComDset.Tables(0).Columns.Count - 1
           .cells(1, i).value = ComDset.Tables(0).Columns(col).ColumnName
           .cells(1, i).EntireRow.Font.Bold = True
           i += 1
      Next

            i = 2

       Dim k As Integer = 1
       For col = 0 To ComDset.Tables(0).Columns.Count - 1
          i = 2
          For row = 0 To ComDset.Tables(0).Rows.Count - 1
              .Cells(i, k).Value = ComDset.Tables(0).Rows(row).ItemArray(col)
               i += 1
          Next
               k += 1
       Next
          filename = "c:\File_Exported.xls"
         .ActiveCell.Worksheet.SaveAs(filename)
 End With

Points of Interest

I used simple For loops.... and insert the values by Rows, Columns and Cells formats.

History

I proposed this after I used it in my company project which was appreciate by the customers.