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Thread: A question on VB.NET

  1. #1
    Join Date
    Jun 2007

    A question on VB.NET

    Hi to all,
    I want to run excel solver in a VB.NET routine.
    I have installed VSTO but when I want to compile my program (I have written it in VB.NET language in a software, it is not in the Visual Studio 2005 main Program) it finds an error: "Namespace or type 'Interop' for the Imports 'Microsoft.Office.Interop' cannot be found."
    Do u know the reason?
    The code for more information is this:

    Imports Microsoft.Office.Interop
    Imports System.Runtime.InteropServices

    Private Sub bSolveExel_Click(ByVal sender As System.Object, ByVal e
    As System.EventArgs) Handles bSolveExcel.Click

    Dim wb As Microsoft.Office.Interop.Excel.Workbook
    Dim ExSheet As Microsoft.Office.Interop.Excel.Worksheet
    Dim result as Double

    wb = ExApp.Workbooks.Open("E:\Excel-Sheet.xls")

    ExApp.DisplayAlerts = False
    ExApp.Visible = False


    ExSheet = ExApp.Worksheets("Table1")
    ' Code to save parameters in Excel Sheet
    CType(ExSheet.Cells.Item(3, 2), Excel.Range).Value2 = TextBox.Text
    ' Code to copy result to the variables
    result = CType(ExSheet.Cells.Item(9, 2), Excel.Range).Value2

    ExApp.DisplayAlerts = False

    Catch ex As COMException
    MessageBox.Show("Error accessing Excel: " + ex.ToString())
    Catch ex As Exception
    MessageBox.Show("Error: " + ex.ToString())
    End Try
    End Sub

    After that I wrote some Macros in the Excel Sheet to start the calculation

    Does any body have an idea?
    Thanks in advance.

  2. #2
    Join Date
    Mar 2005
    Los Angeles, Calif. AKA: Gangsta Yoda™
    Did you install the PIAs for Office? Link in my signature for more on Office Interop.
    VB/Office Guru™ (AKA: Gangsta Yoda®)
    I dont answer code questions via PMs.
    Microsoft MVP 2006-2009
    Office Development FAQ (VBA, VB6, VB.NET, C#)
    Software Engineer MCP (VB6 & .NET)
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