Dot net frame Work Winodws application Serilog function Azure Blob Storage Issue

I tried to store Serilog log details in Azure Blob Storage using windows application it worked fine in the program.csbut couldn't work in Form.cs when I called the ErrorLog function, ErrorLog.txt files were created successfully in azure blob storage but in that file log is empty, and the program is stuck on "logger.Error"

enter image description here