asp. How to call vb DLL function in net project

What we do now asp.net The supply chain management system needs to be connected with the company's oa Office system coexistence , So you need to call oa In the office system dll An encryption function in

The procedure of calling is as follows ：

One 、 Start - function , Input  regsvr32 "x:\path\yourdll.dll"  among x:\path\yourdll.dll On behalf of you VB Of dll The path and file name of .

Two 、 take yourdll.dll Add to the project

ok stay cs Instantiation in the file can call the desired function