please check database connection first. class not registed exception?

Question

(Exception from HRESULT: 0x80040154(REGDB_E_CLASSNOTREG))

Tuhin Paul · Answer

The error message "class not registered exception" with the HRESULT code REGDB_E_CLASSNOTREG indicates that a required COM object or DLL is not registered correctly on the system. This can occur when a 32-bit application is trying to use a 64-bit DLL or vice versa, or when the required component is not installed or registered correctly.

Vishal Yelve · Answer

Hi Nuru, Try this Please set the project platform target to x86. Since most of the COM you may be using in your project was built on x86. Project Properties-->Build-->Target Platform-->x86 refer below links https://www.codeproject.com/Questions/612148/Class-not-registered-Exception-from-HRESULT-0x8004 https://stackoverflow.com/questions/51854504/how-to-fix-this-issue-com-exception-class-not-registered-exception-from-hresul https://stackoverflow.com/questions/1496214/how-to-solve-com-exception-class-not-registered-exception-from-hresult-0x80040

Rajkiran Swain · Answer

The "class not registered" error typically occurs when the application is unable to locate or load a particular component or class. In this case, the error message suggests that there may be an issue with the database connection and the class may not be registered properly. To troubleshoot this issue, you can try the following steps: Check if the database server is running and accessible. Verify that the connection string used by the application is correct and points to the correct database server. Check if the required database driver is installed on the system. Verify that the necessary DLL files are registered properly using the regsvr32 command. Try restarting the application or the system to see if the issue resolves itself. If the above steps do not resolve the issue, it may be necessary to debug the application code or seek assistance from a technical support team.