working with error in windows form

Question

5.00/5 (1 vote)

See more:

i am working with errorin windows form. two textbox and a submit button. the textbox are all required field must be submitted
the problem is when i click on submit without filling the textbox i should get an error that this all field are compulsory how can i do that?
by clicking on button error comes but after clicking the message box the user should get which textbox should be fille i used tabindex but only the fisrt textbox is showing error and i want both of them should be errored

Posted 9-Nov-12 19:56pm

sariqkhan

Updated 16-Dec-12 18:03pm

v3

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Ank_ush · Accepted Answer · 2012-11-10T04:55:00

Hi Friend ! Just try this code !!! This will sure solve your problem.

C#

private void button1_Click(object sender, EventArgs e)
       {
           if (textBox1.Text == "")
           {
               errorProvider1.SetError(textBox1, "Please Enter the value in First Box.");
               MessageBox.Show("Data not Submitted", "Form", MessageBoxButtons.OK, MessageBoxIcon.Error);
               textBox1.Focus();
           }
           else if (textBox2.Text == "")
           {
               errorProvider1.SetError(textBox2, "Please Enter the value in Second Box.");
               MessageBox.Show("Data not Submitted", "Form", MessageBoxButtons.OK, MessageBoxIcon.Error);
               textBox2.Focus();
           }
           else
           {
               MessageBox.Show("Data Submitted", "Form", MessageBoxButtons.OK, MessageBoxIcon.Information);
           }
       }

       private void textBox1_TextChanged(object sender, EventArgs e)
       {
           if (textBox1.Text != "")
           {
               errorProvider1.SetError(textBox1, "");
           }
       }

       private void textBox2_TextChanged(object sender, EventArgs e)
       {
           if (textBox2.Text != "")
           {
               errorProvider1.SetError(textBox2, "");
           }
       }

If any problem, then plz reply or comment.

wojjas369 · Accepted Answer · 2012-11-12T22:51:00

1)

C#

return string.IsNullOrEmpty(NameToValidate) ? false : true;

Is equivalent to:

C#

if (NameToValidate == "")
{
    return false;
}
else
{
    return true;
}

It's just a shorter form of writing if-else statements that are so common.
But there is one more difference. It's the IsNullOrEmpty() method of the string class. If null is sent to isNameValid() and you are using NameToValidate == "" your function will crash cause you can't compare null (nothing) with an empty string "". That's why it's safer to use IsNullOrEmpty() this method returns true/false and thus can be used directly in the if-test. Just as we use iNameValid directly in an if-statement.

2)

C#

ValidatingTextBox((TextBox)sender);

From within this event-handler the private method ValidatingTextBox is called. As the parameter sender is specified. But, the private variable sender is of the general type Object which can be converted to the type that ValidateingTextBox expects. ValidatingTextBox expects System.Windows.Forms.TextBox and that's why an type convert is happening. The type convert is done by using syntax: (new-type-to-convert-to)object-to-convert. in this case: (TextBox)sender

wojjas369 · Accepted Answer · 2012-11-10T02:13:00

Hi,

Note that the Validating event fires when the textbox looses focus. So, if I just open the form and klick the button only the button's Click-event will fire and not the Validating events.

The trick is to extract the logic from within the Validating event-handler into a seperate function. In my code example I called this function ValidatingTextBox().

This allows us to call the extracted logic from several handlers. From the Validating and from the Click event-handler for the button.

In the example below I did some refactoring, the Validating was doing the same thing. Hope it's still clear and shows the point.

C#

#region Methods
public Form1()
{
    InitializeComponent();
}

public bool isNameValid(string NameToValidate)
{
    return string.IsNullOrEmpty(NameToValidate) ? false : true;
}

private bool ValidatingTextBox(TextBox TextBoxToValidate)
{
    if (isNameValid(TextBoxToValidate.Text))
    {
        errorProvider1.SetError(TextBoxToValidate, "");
        return true;
    }
    else
    {
        errorProvider1.SetError(TextBoxToValidate, "enter something");
        return false;
    }
}
#endregion

#region Event Handlers
private void textBox_Validating(object sender, CancelEventArgs e)
{
    ValidatingTextBox((TextBox)sender);
}
private void button1_Click(object sender, EventArgs e)
{
    bool vName = ValidatingTextBox(textBox1);
    bool vName2 = ValidatingTextBox(textBox2);

    if (vName && vName2)
    {
        MessageBox.Show("sucess");
    }
    else
    {
        MessageBox.Show("error");
    }
}
#endregion

working with error in windows form

3 solutions

Solution 2

Solution 3

Solution 1

Add your solution here

Preview 0