Linking Login form with Form2

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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");
        }

Posted 31-Jan-16 19:36pm

Member 12247039

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BillWoodruff 1-Feb-16 7:15am

Is this Windows Forms ? If this is Windows Forms, I have some ideas for you.

1 solution

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Anisuzzaman Sumon · Answer 1 · 2016-01-31T20:29:00

Solution 1

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

C#

string.Compare()

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

C#

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");
}

Posted 31-Jan-16 20:29pm

Anisuzzaman Sumon

Updated 31-Jan-16 21:10pm

v2

Comments

Member 12247039 1-Feb-16 3:02am

The string.Compare() command should be used at which place?

Also i get following errors :

Error 17 'mag_2701.abc' does not contain a definition for 'label1_Click' and no extension method 'label1_Click' accepting a first argument of type 'mag_2701.abc' could be found (are you missing a using directive or an assembly reference?)

Error 18 The type or namespace name 'Form2' could not be found (are you missing a using directive or an assembly reference?)

Anisuzzaman Sumon 1-Feb-16 3:10am

Check again

Anisuzzaman Sumon 1-Feb-16 3:12am

If it works for you and close the thread by accepting as answer.Happy coding :)

Member 12247039 1-Feb-16 3:17am

I am still getting those two errors that i mentioned above.

Anisuzzaman Sumon 1-Feb-16 3:20am

Delete Form1 and add again a form named Form1 and design again.that fix it

Anisuzzaman Sumon 2-Feb-16 0:25am

Sir check it ,I have used it
https://msdn.microsoft.com/en-us/library/84787k22(v=vs.110).aspx

BillWoodruff 2-Feb-16 1:19am

Okay, I was too critical, and I am changing my vote to a #3. fyi: I do not consider a vote of #3 a down-vote.

Note that the 'Text property value returned from a TextBox is never 'null: you can set it to 'null without error, but when you read it back, it will be 'String.Empty, not 'null.

Note there is no problem in the OP's scenario which indicates that using '== is not perfectly valid.

Note that 'Compare(string,string) is dependent upon the current CompareOptions in the current CultureInfo, and is most commonly used in comparing sort-order; in fact, Microsoft "warns" you to use another overload in which you specify the StringComparison :

"Warning

When comparing strings, you should call the Compare(String, String, StringComparison) method, which requires that you explicitly specify the type of string comparison that the method uses. For more information, see Best Practices for Using Strings in the .NET Framework."