c# - How to save List into text file

public List CodeLogOnlyList = new();
...
await System.IO.File.WriteAllLinesAsync( _filename, this.CodeLogOnlyList );

c# - How to access to parent form (for form)

itemWebLink.Web.KeyDown += ((FMain)this.ParentForm).Web_KeyDown;

c# - How applicate LINQ WHERE and FOREACH

this.ConditionGroups.Where( x => x.Active == true ).ToList().ForEach( condition => {
  ...        
} );

sql server - How to call exec proc and show its result

declare @i int;
exec @i = users_exists 'worker01';
print @i;

Output:

0