how to validate text in textbox

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Hello Team ,

I have a simple project having textbox and button

I want to show that If my textbox having specific text like " This is codeproject " then on

clicking button , it should show "Welcome"

otherwise it should show error.

please tell me how to do it.

-Rectus

Posted 25-Jun-14 3:09am

Member 10272175

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Nandakishore G N 25-Jun-14 9:46am

Paste, what have you done till now?

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Thomas Daniels · Answer 1 · 2014-06-25T03:23:00

For this validation, a if-else statement is enough. Create a label in which you'll show "Welcome" or an error. When adding the label to your web form, it should be empty. Then, add the following code to your button click method:

C#

// in your button click method:
if (yourTextBox.Text.Equals("This is codeproject", StringComparison.Ordinal)) // if you want a case-insensitive comparison, use OrdinalIgnoreCase
{
    yourLabel.Text = "Welcome";
}
else
{
    yourLabel.Text = "Error";
}

However, for more advanced validation techniques (like only allow values between a specific range, validating a required field ...), it is better to use the ASP.NET Validation Controls:
http://msdn.microsoft.com/en-us/library/debza5t0%28v=vs.100%29.aspx[^]

King Fisher · Answer 2 · 2014-06-25T03:24:00

Solution 2

C#

protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text == "This is CodeProject")
        {
            Response.Write("Welcome");//your mesg
        }
        else
        {
            Response.Write("ERROR"); msg
        }
    }

Posted 25-Jun-14 3:24am

King Fisher

OriginalGriff · Answer 3 · 2014-06-25T03:24:00

Exactly how you do this depends on the exact environment you are working in: for a website, I would probably do it in JavaScript as it would be a lot more responsive than doing the check at the server.

But...you can do it in C# (and it will work in web or windows) by handling the Click event for the button, and checking the Text property of the textbox:

C#

if (myTextBox.Text == "This is Codeproject")
   {
   // Display your "welcome" message
   ...
   }
else
   {
   // Show error message
   ...
   }

We can't tell you how to display it: we don't know enough about your system.

how to validate text in textbox

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