how to check whether a textbox contains a decimal point followed by a single digit in the textbox at the end

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Hi.

i have a text box which accepts numeric and decimal values. The max length of text box is 4.

So how can i check whether a text box contains a decimal point followed by a single digit at end of text box.

like ex:

if i have a value as 12.5 in the text box,then how can i check that a text box is containing a value ".5" at the end of textbox in C#

please provide me a solution.

Posted 13-Mar-14 20:12pm

Member 10593922

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3 solutions

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AndrewCharlz · Answer 1 · 2014-03-13T20:32:00

Solution 1

C#

string a = "12.5";


            bool HasDecimal = a.Contains('.');


            if (HasDecimal == true)
            {
               int i = a.IndexOf('.');
               int j = a.Length;
               int k = j - i;
               a = a.Substring(i, k);
// now a contains only decimal value

            }
        else {
//no decimal
}

Posted 13-Mar-14 20:32pm

AndrewCharlz

Updated 13-Mar-14 20:34pm

v2

Comments

Member 10593922 14-Mar-14 2:41am

thank u for the reply. i will try to implement this... but what about the digit after decimal point how can i check that?

AndrewCharlz 14-Mar-14 3:13am

the out put will be ".5"

R-a-v-i-k-u-m-a-r · Answer 2 · 2014-03-13T20:37:00

Solution 2

Try this

C#

if(TestBox1.Text.Contains('.')&&TextBox1.Text.Split('.')[1].Length==1)
{
  //code
}

Posted 13-Mar-14 20:37pm

R-a-v-i-k-u-m-a-r

Updated 13-Mar-14 20:43pm

v2

Matt T Heffron · Answer 3 · 2014-03-14T07:07:00

Solution 3

C#

private static readonly Regex OneDecimalCheck = new Regex(@"\.\d$");
// ....
if (OneDecimalCheck.IsMatch(TheTextBox.Text))
{
  // TheTextBox content Text ends with . followed by a digit.
}

Posted 14-Mar-14 7:07am

Matt T Heffron