By: Issac in VB.net Tutorials on 2009-01-31
To open or edit an Excel 2007 worksheet in you have to add Microsoft 12.0 Object Library in your project. From the following pictures to show how to add Excel reference library in your project.
1. Create a new project and add a button to the Form.
Select reference dialouge from Project menu
Select Microsoft Excel 12.0 Object Library and click OK button
Now you can start coding to open or read from Excel file and edit cells.
Imports Excel = Microsoft.Office.Interop.Excel Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim xlApp As Excel.Application Dim xlWorkBook As Excel.Workbook Dim xlWorkSheet As Excel.Worksheet xlApp = New Excel.ApplicationClass xlWorkBook = xlApp.Workbooks.Open("c:\test1.xlsx") xlWorkSheet = xlWorkBook.Worksheets("sheet1") 'display the cells value B2 MsgBox(xlWorkSheet.Cells(2, 2).value) 'edit the cell with new value xlWorkSheet.Cells(2, 2) = "http://java-samples.com" xlWorkBook.Close() xlApp.Quit() releaseObject(xlApp) releaseObject(xlWorkBook) releaseObject(xlWorkSheet) End Sub Private Sub releaseObject(ByVal obj As Object) Try System.Runtime.InteropServices.Marshal.ReleaseComObject(obj) obj = Nothing Catch ex As Exception obj = Nothing Finally GC.Collect() End Try End Sub End Class
In the code, Imports Excel = Microsoft.Office.Interop.Excel - we assign the excel reference to a variable Excel.
When you execute this code, the program opens the file in diecory c:\test1.xlsx and edits the content in the cell B2; it replaces the old content to "http://java-samples.com". Before running this program you have to create an excel file name test1.xlsx and add some data in the cell B2.
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