is it possible to connect SFTP using PUTTY KEY string?

[vsplcDJ25]

I am trying to connect SFTP using with PUTTY Key string through C# but could not able to connect to the server. received an exception while connecting to SFTP and the exception is "Invalid Private key file".
Please let me know with possible solution about using with SSH.NET.

Convert the key to OpenSSH format using PuTTYGen. PPK files are (as far as I can tell) not supported.

[mgamache]

PPK files are not supported. Usually PPK files are derived from PEM or other files that are supported.