Export Excel to Datatable and Datatable to Excel vb.net

Please refer:

Export the Datatable records to Excel sheet in C#.net:
Export to EXCEL from Datatable in C#.Net[^]

Similar discussion: Click here[^]

Export a DataTable to Excel in ASP.NET[^]

Following link shows how to import or export DataTable to Excel or HTML files by using GemBox.Spreadsheet .NET component.
Import or Export DataTable to Excel[^]

Imports Microsoft.Office.Interop.Excel
Imports System.Collections.Generic
Imports System.Diagnostics
Imports Microsoft.Office.Interop


'把Excel数据导入到DataGridView里
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
Dim excel As Microsoft.Office.Interop.Excel.Application = New Microsoft.Office.Interop.Excel.Application()
Dim xlBook As Microsoft.Office.Interop.Excel.Workbook
Dim xlSheet As Microsoft.Office.Interop.Excel.Worksheet
Dim fileDialog As OpenFileDialog = New OpenFileDialog()
Dim FileName As String
fileDialog.Filter = "Microsoft Excel files (*.xls)|*.xls"
If fileDialog.ShowDialog = System.Windows.Forms.DialogResult.Cancel Then Exit Sub
If fileDialog.FileName = Nothing Then
MsgBox("请选择要导入的excel文件", , "提示")
End If
FileName = fileDialog.FileName
xlBook = excel.Application.Workbooks.Open(FileName)
xlSheet = xlBook.Application.Worksheets(1)
Dim col As Integer = 0
Dim i As Integer = 2
Me.dgv.Rows.Clear()
Do While i < 3
dgv.Rows.Add(i)
dgv.Rows(col).Cells(0).Value = xlSheet.Cells(i, 1).value
dgv.Rows(col).Cells(1).Value = xlSheet.Cells(i, 2).value
dgv.Rows(col).Cells(2).Value = xlSheet.Cells(i, 3).value
dgv.Rows(col).Cells(3).Value = xlSheet.Cells(i, 4).value
dgv.Rows(col).Cells(4).Value = xlSheet.Cells(i, 5).value
dgv.Rows(col).Cells(5).Value = xlSheet.Cells(i, 6).value
i += 1
col += 1
Loop
excel.ActiveWorkbook.Close(False)
xlSheet = Nothing
xlBook = Nothing
excel = Nothing
If dgv.Rows.Count >= 1 Then
MessageBox.Show("导入成功")
Else
MessageBox.Show("导入失败")
End If
End Sub



Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn2.Click
Dim saveExcel As SaveFileDialog
saveExcel = New SaveFileDialog
saveExcel.Filter = "Excel文件(.xls)|*.xls"
Dim filename As String
If saveExcel.ShowDialog = System.Windows.Forms.DialogResult.Cancel Then Exit Sub
filename = saveExcel.FileName
Dim excel As New Application
excel = New Excel.Application
excel.DisplayAlerts = False
excel.Workbooks.Add(True)
excel.Visible = False
Dim i As Integer
For i = 0 To dgv.Columns.Count - 1
excel.Cells(1, i + 1) = dgv.Columns(i).HeaderText
Next
'设置标题
Dim j As Integer
For i = 0 To dgv.Rows.Count - 1 '填充数据
For j = 0 To dgv.Columns.Count - 1
excel.Cells(i + 2, j + 1) = dgv(j, i).Value
Next
Next
excel.Workbooks(1).SaveCopyAs(filename) '保存
Me.Close()
End Sub