Microsoft.Xna.Framework.Graphics.SpriteBatch.CheckValid C# (CSharp) Method

        void CheckValid(SpriteFont spriteFont, StringBuilder text)
        {
            if (spriteFont == null)
                throw new ArgumentNullException("spriteFont");
            if (text == null)
                throw new ArgumentNullException("text");
            if (!_beginCalled)
                throw new InvalidOperationException("DrawString was called, but Begin has not yet been called. Begin must be called successfully before you can call DrawString.");
        }