SampleContext.cs

public class SampleContext:DbContext
{
        public SampleContext()
        {

        }

        public SampleContext(string connectionString)
        {
            _connectionString = connectionString;
        }

        public SampleContext(DbContextOptions<SampleContext> options) : base(options)
        { 
        
        }
        
        //Removed other code
        
}