Validate empty textboxes

Question

0.00/5 (No votes)

See more:

In my Windows Application, there is a form called Order Details in which I used many textboxes and comboboxes to input data. Whenever the user will click the Add button it should prompt the user if there will be a blank textbox if the user left it blank. How is it possible?
I dont know more. Please help me.

Posted 11-Oct-13 20:25pm

Md M Ahmad

Add a Solution

Comments

thatraja 12-Oct-13 2:29am

Google for "C# Validate empty textboxes"

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)

Ashwani Gusain · Answer 1 · 2013-10-11T20:49:00

Solution 2

you should use if else statemet for this

C#

if(textbox1.text!="" && textbox2.text!="" or so no...)
{
your code.....
}
else
{
message.show("Please fill full info ");

}

Posted 11-Oct-13 20:49pm

Ashwani Gusain

Updated 11-Oct-13 20:50pm

v2

Ehsan Skardu · Answer 2 · 2013-10-11T20:48:00

Try in this way;

private bool WithErrors()
{
    if(textBox1.Text.Trim() == String.Empty) 
        return true; // Returns true if no input or only space is found
    if(textBox2.Text.Trim() == String.Empty)
        return true;
    // Other textBoxes.

    return false;
}

private void buttonSubmit_Click(object sender, EventArgs e)
{
    if(WithErrors())
    {
        // Notify user for error.
    }
    else
    {
        // Do whatever here... Submit
    }
}

Akinmade Bond · Answer 3 · 2013-10-11T21:09:00

I'm assuming you don't wanna check the textboxes individually, like

C#

//C# 4.0
if (String.IsNullOrWhiteSpace(textbox.Text)) 
{
//The textbox is empty.
MessageBox.Show("You have empty fields in the form");
}

//C# < 4.0
if (String.IsNullOrEmpty(textbox.Text.Trim())
{
//The textbox is empty.
MessageBox.Show("You have empty fields in the form");
}

That allows you to check a specific control and report on it.

But when you have too many textbox controls, you can do this

C#

foreach (Control control in this.Controls)
{
    if (control is TextBox && String.IsNullOrWhiteSpace(((TextBox)control).Text))
    {
        //This control is empty. //Do whatever you want here.
        return;
    }
    //You can even check if there are unchecked CheckBoxes or Empty Comboboxes
    if (control is CheckBox && !((CheckBox)control).Checked)
    {
       //This Checkbox is uncheked.
       return;
    }
}

Validate empty textboxes

3 solutions

Solution 2

Solution 1

Solution 3

Add your solution here

Preview 0