C# 对richtextbox文本操作 两端对齐 分散对其 代码怎么写？就像word里的对其一样

现在只知道左对齐 右对齐 还有 居中，求知道的大神分享下代码，谢谢啦！！！

我只有TextBox的，看看能不能帮到你吧！

private void 居中ToolStripMenuItem_Click(object sender, EventArgs e) {
            if (this.ActiveMdiChild != null) {
                (this.ActiveMdiChild as Form2).txtFromText.TextAlign = HorizontalAlignment.Center;
            }

        }

        private void 左对齐ToolStripMenuItem_Click(object sender, EventArgs e) {
            if (this.ActiveMdiChild != null) {
                (this.ActiveMdiChild as Form2).txtFromText.TextAlign = HorizontalAlignment.Left;
            }
        }

        private void 右对齐ToolStripMenuItem_Click(object sender, EventArgs e) {
            if (this.ActiveMdiChild != null) {
                (this.ActiveMdiChild as Form2).txtFromText.TextAlign = HorizontalAlignment.Right;
            }
        }