How to manipulate an excel workbook with Excel.Workbook - vb.net

Question

So, I can't find any methods with file opening in Excel.Workbook or Excel.Application, and I am wondering why.
I have path to an Excel file, and I would like to manipulate it. I understand I have to use Excel.Application, Excel.Workbook, and Excel.Worksheet. The file to the Excel file is ExcelFilePath, what should I do to make it possible?

Answer 1

You first need to add the reference to Microsoft.Office.Interop.Excel to your project in order to use the Excel API, then fill the variables:
Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook
Dim xlWS As Excel.Worksheet
xlApp = New Excel.ApplicationClass
xlWorkBook = xlApp.Workbooks.Open(sFilePath)
xlWS = CType(xlWorkBook.Worksheets(sheetNameOrIndex), Excel.Worksheet)
And then you only need to use the methods they have. For example:
Dim sVar as String = xlWS.Range("C5").Value.ToString()

Answer 2

Try this: from my project
Dim xapp As New Microsoft.Office.Interop.Excel.Application
Dim wb As Workbook = xapp.Workbooks.Add
Dim ws As Worksheet = wb.Worksheets(1)
ws.Activate()
'Fill header of the sheet----------------------------------
For i As Integer = 1 To dgvcustomer.Columns.Count
ws.Cells(1, i) = dgvcustomer.Columns(i - 1).HeaderText
Next
'End header------------------------------------------------
Dim Dgrow, Dgcell, Dgcol As Integer
Dgrow = 1
Dgcell = 1
'Fill Sheet ------------------------------------------------------------------------------------------------
While (Dgrow <= dgvcustomer.Rows.Count)
Dgcol = 1
While (Dgcol <= ws.UsedRange.Columns().Count)
ws.Cells(Dgrow + 1, Dgcol).value = dgvcustomer.Rows(Dgrow - 1).Cells(ws.Cells(1, Dgcol).value).Value
Dgcol += 1
End While
Dgrow += 1
End While
'End fill sheet---------------------------------------------------------------------------------------------
wb.SaveAs(dlgSaveFile.FileName)
wb.Close()
xapp.Quit()