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.