how to handle if only a decimal point is entered in the texbox in C# on click of ok button

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Hi,

I have an textbox which accepts numeric and decimal value.

So when the user enters 0, it will display an alert message on click of ok button.
An alert should be displayed even if the user enters any decimal value along with 0 such as

0.-- valid
00.-- valid
000.-- valid
0.0-- valid
00.0-- valid
etc

so i used Convert.ToDecimal(plannedHours) == 0

but now the problem is am not able to check if only decimal value is entered in the textbox. since when only decimal point is entered, its trying to convert a decimal point into a decimal because of the above condition.

pleease help me?

Posted 11-Mar-14 21:40pm

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ArunRajendra 12-Mar-14 4:00am

Do you mean if the user enters only "."? What should be the behavior if user enters only "."?

2 solutions

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OriginalGriff · Answer 1 · 2014-03-11T22:16:00

Solution 1

Don't use Convert.ToDecimal - use decimal.TryParse instead.
It returns a bool value which is true if the conversion worked (I.e. it was a valid number)

Posted 11-Mar-14 22:16pm

OriginalGriff

Er. Puneet Goel · Answer 2 · 2014-03-11T22:24:00

So the problem is when user enter"00." the it throw error in conversion,right ?

The solution is you can check is string comming from text box contains "." or not.
Ypu can accomplish this using

if(planedHousrs.Contains('.'))
{
//Here goes you next if conidtion
if(Convert.ToDecimal(plannedHours) == 0)
{

}
}

Alternative:
if(planedHousrs.Contains('.'))
{
//Here just add 0 in last as"0" after "." doesn't effect you value but it will fix you error
plannedHousrs = plannedHousrs + "0";

}

//Here you next conidtion
Convert.ToDecimal(plannedHours) == 0