How to write a code for textboxes take without null values

Question

1.00/5 (1 vote)

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Dear Friends,

I have two textboxes like TextBox1 & TextBox2. Now whenever click to submit button i want error alter message if both textboxes are empty, if either one textbox data is fill it shows successfull message.

Note: I need data at least one textbox either TextBox1 or TextBox2 or both by using C# code?

Thanks in advanced.

Posted 5-Aug-14 19:49pm

Member 10021658

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Comments

Sergey Alexandrovich Kryukov 6-Aug-14 2:28am

To start with: what your text box class? Or what is the application type and UI library used?
—SA

Sergey Alexandrovich Kryukov 6-Aug-14 2:51am

By the way, you formally accepted a totally incorrect answer; it will give you wrong result if one text box is empty and another is not. Don't use this false "solution". There is a button to cancel your acceptance.
—SA

2 solutions

Solution 2

Here is the thing to take into account: a text box value is never null but can be empty.

So, for the two, a very short line to check would be

C#

if (TextBox1.Text + TextBox2.Text != string.Empty) //...

However, it's possible that your requirement is not having non-empty text, but also not having the text consisting only of the blank space characters. If so, the check could be improved with a bit more complex on-liner:

C#

if (TextBox1.Text.Trim() + TextBox2.Text.Trim() != string.Empty) //...

One note: never ever use auto-generated names like TextBox1 or TextBox2; they violate (good) Microsoft naming conventions and are not really intended for permanent use; you need to rename all such name to correct semantically sensible names using correct English spelling. It will greatly improve maintainability of your code.

—SA

Posted 5-Aug-14 20:33pm

Sergey Alexandrovich Kryukov

Updated 5-Aug-14 20:35pm

v2

Comments

CPallini 6-Aug-14 2:46am

Very good. 5.

Sergey Alexandrovich Kryukov 6-Aug-14 2:49am

Thank you, Carlo.
—SA

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CB Sharma · Accepted Answer · 2014-08-05T19:58:00

Solution 1

Hello

Write below code on submit button click event.

if(string.IsNullOrEmpty(TextBox1.Text) && string.IsNullOrEmpty(TextBox2.Text))
{
MessageBox.Show("Error");
}
else
{
//Do you code here
}

Posted 5-Aug-14 19:58pm

CB Sharma

Comments

Sergey Alexandrovich Kryukov 6-Aug-14 2:29am

There is no need to check for null: text box value is never null. It's enough to check for empty.
Please see my answer.

Besides, your code gives incorrect result. If you read OP's requirements, you would check if at least one of the text boxes would be non-empty. Instead, you check if both text boxes are non-empty. This kid's logical mistake well deserves my vote of 1, sorry.

—SA