类型转换

3种

  private void button1_Click(object sender, EventArgs e)
        {
            string num1 = this.textBox1.Text.Trim();
            string num2 = this.textBox2.Text.Trim();
           1. this.textBox3.Text = ((Convert.ToUInt32(num1) + Convert.ToUInt32(num2))).ToString();
           2.  var x = int.Parse(num1);
            var y = int.Parse(num2);
           3.  float a = 1.1f;
            int s = (int)a;
            this.textBox3.Text = (x + y).ToString();
        }