将登录表单与Form2链接 [英] Linking Login form with Form2

问题描述

我有一个登录表单，其中包含用户ID&用户输入的密码。只有两个字段都正确才能指向下一个表格。即使其中一个字段错误，它也应显示一个消息框，说明特定字段不正确。我的代码的一部分如下所示。但它不起作用。

I have a login form which contains an user id & password to be entered by the user. Only if both fields are correct should it direct to next form. Even if one of the field is wrong, it should display a message box saying the particular filed is incorrect. A part of my code is as given below. But it is not working.

private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.txt = "USER" && textBox2.txt = "password123")
            {
                this.Hide();
                Form2 PROJ_FORM1 = new Form2();
                PROJ_FORM1.Show();
            }
            else  if (textBox1.txt != "USER" && textBox2.txt = "password123")
                MessageBox.Show("Incorrect User Id");
            else  if (textBox1.txt = "USER" && textBox2.txt != "password123")
                MessageBox.Show("Incorrect Password");
            else  if (textBox1.txt != "USER" && textBox2.txt != "password123") 
                MessageBox.Show("Incorrect User Id and Password");
        }

推荐答案

你不应该得到一个属性textBox1.txt而不是textBox1.Text.however

=是赋值运算符，其中in ==用于比较相等运算符。并使用

You should not get a property textBox1.txt instead textBox1.Text.however
= is assignment operator where in == is for compare equality operator.And use

string.Compare()

比较你不应该使用的字符串==来比较像这样的字符串

。但是下面是你的

to compare string you should not use == to compare string like this
.However below is your

private void button1_Click(object sender, EventArgs e)
{
    if (string.Compare(textBox1.Text,"USER")==0 && string.Compare(textBox2.Text,"password123")==0)
    {
        this.Hide();
        Form2 PROJ_FORM1 = new Form2();
        PROJ_FORM1.Show();
    }
    else if (string.Compare(textBox1.Text, "USER") != 0 && string.Compare(textBox2.Text,"password123")==0)
        MessageBox.Show("Incorrect User Id");
    else if (string.Compare(textBox1.Text, "USER") == 0 && string.Compare(textBox2.Text,"password123")!=0)
        MessageBox.Show("Incorrect Password");
    else if (string.Compare(textBox1.Text,"USER")!=0 && string.Compare(textBox2.Text,"password123")!=0)
        MessageBox.Show("Incorrect User Id and Password");
}

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