WatermarkTextBox.ApplyWatermark C# (CSharp) Method

        public void ApplyWatermark()
        {
            if (!this._watermarkActive && string.IsNullOrEmpty(this.Text)
                || ForeColor == Color.Gray ) 
            {
                this._watermarkActive = true;
                this.Text = _watermarkText;
                this.ForeColor = Color.Gray;
            }
        }
        /// <summary>