Mixed mode debugging for x64 processes is only supported when using Microsoft.NET Framework 4 or greater

.NET Framework versions earlier than 4 do not provide support for mixed-mode debugging of x64 processes. That means that you cannot step from managed code to native code, or from native code to managed code, while debugging.

Workarounds

• Update your project to use Microsoft .NET Framework 4 or later.

  -or-

  Debug your managed and native code in separate debugging sessions.

  -or-

  Debug your mixed code as a 32-bit process, as described in the following procedures.

To change the platform to 32-bit (Visual Basic or C#)

1. In Solution Explorer, right-click your project, and then click Properties.

2. In the property pages, click the Compile or the Debug tab.

3. Click Platform and select x86 from the list of platforms.

   By default, the Visual Basic and C# compilers default produce code to run on any CPU. On a 64-bit computer, these binaries run as 64-bit processes. To run on a 32-bit process, you must choose Win32, not AnyCPU.

To change the platform to 32-bit (C/C++)

1. In Solution Explorer, right-click your project, then click Properties.

2. In the Property Pages, click Platform and select Win32 from the list of platforms.

To correct this error

• See Setting Up SQL Debugging.

Related content

• Debug 64-Bit Applications