Here you go.

Code:
        public int GetNamesCount( )
        {
            string[ ] names = NamesForm.txtNames.Text.Split( new String[ ] { "\n" }, StringSplitOptions.RemoveEmptyEntries );
            
            int Count = 0;
            foreach( string name in names )
            {
                Count++;
            }
            if( NamesForm.txtNames.Text.Length == 0 )
            {
                return 0;
            }
            else
            {
                return Count;
            }
        }