想在textBox输入整数时，总是出错。。。switch (comboBox1.Text)
            {
                case "ss":
                    {
                       int a = int.Parse(textBox1.Text);//入字符串的格式不正确
                        //int a = Convert.ToInt32(this.textBox1.Text);
                        label1.Text = "jheui";
                        label2.Visible = false;
                        textBox2.Visible = false;
                        break;
                    }
                case "st":
                    {
                        int a = Convert.ToInt32(this.textBox1.Text);//入字符串的格式不正确
                        label1.Text = "jheui";
                        label2.Visible = true;
                        textBox2.Visible = true;
                        label2.Text = "rst";
                        int b = Convert.ToInt32(this.textBox1.Text);
                        break;
                    }

            }帮忙看看。。。

突然发现不能在这里给a,b付值，直接写textBox1.Text="";这样应该没错，具体的转化在按钮中，大概可以行得通，在蒙中这么想的