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C#在textBox中每输入两个字符自动添加一个特定字符

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
    			this.textBox1.TextChanged -= new System.EventHandler(this.textBox1_TextChanged);
                StringBuilder sb = new StringBuilder();
                int Selection = textBox1.SelectionStart;
                char s = ' ';//用什么字符隔开
    
                string str = textBox1.Text.Replace(s.ToString(), "");
                for (int i = 1; i <= str.Length; i++)
                {
                    sb.Append(str[i-1]);
                    if ((i != 0 && i % 2 == 0 ))//每组几个字符就%几
                    {
                        if (i == str.Length) continue;
                        sb.Append(s);
                        Selection++;
                    }
                }
                Selection = Selection - textBox1.Text.Split(s).Length + 1;
                textBox1.Text = sb.ToString();
                textBox1.SelectionStart = Selection < 0 ? 0 : Selection;
				this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
    }