Finding Characters in a TextBox

[vinay307]

I am working on windows application. My requirement is in my application I am retrieving text files and displaying the contents of text files in text box, but here i want to display text files which contains only numeric data. Where as in my application it will display numeric data as well as alphabets. How can i check text box does it contains numeric data or alphabets?

[Bassem]

Hi,

You can try to convert the retrieved string to double, if it works assign the string to the textbox.Text.

            string s = "1.0";
            try
            {
                Convert.ToDouble(s);
                textBox1.Text = s;
            }
            catch 
            {
                // don't.
            }

[GaryTexmo]

I'm a fan of the double.TryParse method myself... it doesn't have the overhead of a try/catch.

example...

string sPi = "3.14159";
double dPi;
if (double.TryParse(sPi, out dPi))
{
  // success
}
else
{
  // failure
}

Note, you don't necessarily have to have the if statement there... only if you want to tell if the conversion was successful. Hope that helps.

[ThatThatGuy]

Instead of everyhing else you just need to use regular expressions.... in checking whether the text fetched from the file contains only numbers...

Regex reg=new Regex("[0-9]*");
if(reg.IsMatch("fetched Data")
{
//display in textbox
}

[Bassem]

Yes, the last is the best.

Thanks ThatThatGuy, I'll use this one.

>>Edited

Don't forget the floating point numbers!

<<

[vinay307]

Thank U for giving me this solution.