How to programmatically obtain the installation state of Visual Studio .NET or Visual Studio 2005 (884468)

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1. Start Visual Studio .NET.
2. On the File menu, point to New, and then click Project. The New Project dialog box appears.
3. Under Project Types, click Visual Basic Projects or click Visual C# Projects.
   
   Note In Visual Studio 2005, click Visual Basic or Visual C#.
4. Under Templates, click Windows Application, and then click OK. By default, the following behavior occurs:
   • If you are using Microsoft Visual Basic .NET, the Form1 form and the Form1.vb file are created.
   • If you are using Microsoft Visual C# .NET, the Form1 form and the Form1.cs file are created.
5. Add a TextBox control and a Button control to the Form1 form.
6. In Solution Explorer, right-click Form1.vb or Form1.cs, and then click View Code.
7. Add the following code at the top of the file.
   
   Microsoft Visual Basic .NET or Microsoft Visual Basic 2005

   Imports System.Runtime.InteropServices

   Visual C# .NET or Visual C# 2005

   using System.Runtime.InteropServices;
   

8. Add the following code to the declarations section of the Form1 class.
   
   Visual Basic .NET or Visual Basic 2005

   <DllImport("msi.dll")> _
   Public Shared Function MsiQueryProductState(ByVal szProduct As String) As Int32
   End Function

   Visual C# .NET or Visual C# 2005

   [DllImport("msi.dll")]
   public static extern Int32 MsiQueryProductState(string szProduct);
   

9. In Design view of the Form1 form, double-click Button1, and then add the following code to the Button1_Click event procedure.
   
   Visual Basic .NET or Visual Basic 2005

   ' szProdCode is the product code.
   ' Include the product code in braces ({}).
   Dim szProdCode As String = TextBox1.Text.ToString().Trim()
   Dim iErrorReturnQuerryState As Integer
   iErrorReturnQuerryState = MsiQueryProductState(szProdCode)
   MessageBox.Show(iErrorReturnQuerryState.ToString())

   Visual C# .NET or Visual C# 2005

   // szProdCode is the product code.
   //Include the product code in braces ({}).
   string szProdCode = textBox1.Text.ToString().Trim();
   int iErrorReturnQuerryState=MsiQueryProductState(szProdCode);
   MessageBox.Show(iErrorReturnQuerryState.ToString());

10. On the Build menu, click Build Solution.
11. On the Debug menu, click Start. The Form1 form appears.
12. Type the product code in the text box. For example, type {005F0409-6759-11D5-A54F-0090278A1BB8}. This is the product code for Microsoft Visual Studio .NET Enterprise Architect - English.
13. Click Button1.