how to check whether a textbox contains a decimal point in the starting in C#

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Hi,

I have a text box which accepts hours.It will allow only numeric and decimal points.And max of only single decimal point is allowed.

So when the user enters single decimal point in the starting of the textbox without any other digits, and on click of Ok an alert message should be displayed.

How can i achieve that in C#?

Posted 5-Mar-14 22:01pm

Member 10593922

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Mitchell J. · Answer 1 · 2014-03-05T22:07:00

Solution 1

If you are only checking if the input is valid when the user clicks OK, try something like this:

C#

double userinput = 0;
bool isvalid = double.TryParse(yourtextbox.text, out userinput);
if (!isvalid)
{
   MessageBox.Show("Invalid Entry"); //Etc.
}
else
{
   MessageBox.Show("You entered: " + userinput.ToString());
}

Hope this helps :-)

Posted 5-Mar-14 22:07pm

Mitchell J.

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Member 10593922 6-Mar-14 4:46am

thank you it was helpful for me.

Mitchell J. 6-Mar-14 5:14am

Glad to help. :) Did you want to accept the solution using the button?