winform 记事本 剪切 粘贴 全选 撤销

 private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e)
         {
             textBox1.Undo();
         }

         private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e)
         {
             if (textBox1.SelectionLength>)
             {
                 textBox1.Cut();
             }
         }

         private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)
         {
             if (textBox1.SelectionLength > )
             {
                 textBox1.Copy();
             }
         }

         private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e)
         {
             textBox1.Paste();
         }

         private void 全选AToolStripMenuItem_Click(object sender, EventArgs e)
         {
             textBox1.SelectAll();
         }