The classes in the file cannot be designed, so the designer vs2008 (Visual Studio 2008) x64 is not displayed for the file.

Project property running platform x64

 

Form2 inherits from form1, And the form2 designer reports an error

 

64-bit DLL cannot be loaded. dll cannot find the specified Module

 

The reason is that vs2008 (Visual Studio 2008) does not install 64 compilers by default.

 

Installation Reference: Http://blog.csdn.net/clever101/article/details/8844314>

 

This is reported when the SP1 Patch is installed,

 

 

Installation Directory: D: \ Program Files (x86) \ Microsoft Visual Studio 9.0 \ Microsoft Visual Studio team System 2008 team suite-CHS

Create the WCU \ SMO folder and copy sqlsysclrtypes. MSI from the vs90sp1 directory in the SP1 package.

Select D: \ Program Files (x86) \ Microsoft Visual Studio 9.0 \ Microsoft Visual Studio team System 2008 team suite-CHS. Are you sure you want to continue the installation?

: Http://files.cnblogs.com/yinyunpan/SQLSysClrTypes.rar

Reference: http://www.360doc.com/content/14/0320/18/10892070_362225309.shtml

It was finally solved.