Unable to cast Object ..error while using VS2013 , MSOffice 2010

  • Thread starter Thread starter DonBishop
  • Start date Start date
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DonBishop

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Hello guys, sorry i am just a beginner when it comes to programming in VB.NET. i am developing a simple data management application for my personal use , part of the functions i want is to be able to export data to excel from the datagrid view. However whenever i run the particular event (by clickin the button) i always get this error

" Unable to cast COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass' to class type 'Dstv.Microsoft.Office.Interop.Excel.Application'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface."

i have tried all i could but this error always come up on this line

xlapp = excel.application


below is the full code which i got from this platform and most peaople confirmed it to be working.


Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook
Dim xlWorkSheet As Excel.Worksheet
Dim misValue As Object = System.Reflection.Missing.Value
Dim i As Integer
Dim j As Integer

xlApp = New Excel.Application()
xlWorkBook = xlApp.Workbooks.Add(misValue)
xlWorkSheet = xlWorkBook.Sheets("Installation")

For i = 0 To DataGridView2.RowCount - 2
For j = 0 To DataGridView2.ColumnCount - 1
xlWorkSheet.Cells(i + 1, j + 1) = _
DataGridView2(j, i).Value.ToString()
Next
Next
For j = 0 To DataGridView2.ColumnCount - 1
xlWorkSheet.Cells(1, j + 1) = DataGridView2.Columns(j).Name
Next
For i = 0 To DataGridView2.RowCount - 1
For j = 0 To DataGridView2.ColumnCount - 1
Dim cell As DataGridViewCell
cell = DataGridView2(j, i)
xlWorkSheet.Cells(i + 2, j + 1) = cell.Value
Next
Next

Dim filename As String = "Installations -" & Now().ToString("yyyy-MM-dd-HH-mm-ss") & ".xlsx"
xlWorkSheet.SaveAs(System.Environment.CurrentDirectory & filename)
xlWorkBook.Close()
xlApp.Quit()

releaseObject(xlApp)
releaseObject(xlWorkBook)
releaseObject(xlWorkSheet)

MsgBox("You can find the file in", System.Environment.CurrentDirectory & "installation.xls")
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

Any assistance will be highly appreciated. Funny enough most related error i have come accross is more of registory error but mine seems unique.

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