How to validate amount textbox in windows application

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In my windows application. I have amount textbox field.It will accept total 11 with 2 decimal places.If i didn't enter decimal places it should allow only 8 places.else It will allow 11 places.how to write validation for this.I'm fresher don't get any idea to try.
Please help me on this.
Thanks in advance.

What I have tried:

I'm fresher don't get any idea to try.
Please help me on this.
Thanks in advance.

Posted 26-Apr-17 1:18am

Member 13153537

Updated 26-Apr-17 18:35pm

v2

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HobbyProggy · Accepted Answer · 2017-04-26T02:11:00

You could use a regex validation on that, a short googling or reading of this[^] should get you into it. With a regex matching you could easily implement your check and make sure only numbers are put in.

On the other hand you could check by your self by validating the inserted string with substring or contains.

For example check if the string is longer than 8 chars and then check if the string contains a '.' at the 8th (9th) place.

Member 13153537 · Accepted Answer · 2017-04-26T18:35:00

Solution 2

private void txtamount_KeyPress(object sender, KeyPressEventArgs e)
       {
            string[] arr = txtamount.Text.Split('.');

           if (arr.Length == 1)
           {
               if (txtamount.Text.Length > 7 && e.KeyChar != '.' && e.KeyChar != (char)Keys.Back)
               {
                   e.Handled = true;
               }

           }
       }

Posted 26-Apr-17 18:35pm

Member 13153537

Updated 26-Apr-17 18:36pm

Comments

HobbyProggy 27-Apr-17 2:00am

I see you understood :)

Member 13153537 27-Apr-17 3:26am

yes thank you