1. 简单的加法计算器，用户在文本框1,2中输入两个数，点击按钮，在文本框3中显示两个数的和。如果1或者2为错误的数据格式，则弹出对话框提示错误。...

       

 

private void button1_Click(object sender, EventArgs e)
         {
             string s1 = textBox1.Text;
             string s2 = textBox2.Text;
             int i1, i2;
             if (int.TryParse(s1, out i1) == false)
             {
                 MessageBox.Show("第一个数字输入不合法");         
               }
             if(int.TryParse(s2,out i2)==false)
             {
                 MessageBox.Show("第二个数字输入不合法");
             }
             int i3 = i1 +i2;
           
             textBox3.Text = Convert.ToString(i3);
         }

 

 

 

 

 

转载于:https://www.cnblogs.com/jessica9920/archive/2012/10/09/2716197.html