how to set text box format decimal values with single dot only?

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I have One Text Box in my Form.I will Give Input Value on Text Box decimal Values Eg:(1.23) but user will give input Eg(1.23.0098) this is not correct format how can i stop multiple Dots(.)without accepted on my text box.Please Help me !!!

Posted 26-Oct-14 21:22pm

jeevakumar.T

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BillWoodruff 27-Oct-14 3:36am

In addition to checking out using a MaskedTextBox, as Mehdi Gholam suggests, also consider using a NumericUpDown Control.

Also, keep in mind that different languages may have different syntaxes for decimal numbers: see:

http://stackoverflow.com/q/5927498/133321

1,234,567.89 // English style
1.234.567,89 // French style
1 234 567,89 // German style
1234567.89 // English mathematical style
1234567,89 // European mathematical style
12.00
12.0
12

2 solutions

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Mehdi Gholam · Answer 1 · 2014-10-26T21:24:00

Solution 1

Use a MaskedTextBox : http://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.mask%28v=vs.110%29.aspx[^]

Posted 26-Oct-14 21:24pm

Mehdi Gholam

CB Sharma · Answer 2 · 2014-10-26T21:32:00

Hello

Try This

C#

private void TextBox1_GotFocus(object sender, RoutedEventArgs e)
       {
           try
           {
               TextBox1.Select(0, TextBox1.Text.Length);
           }
           catch (System.Exception ex)
           {

           }

       }

       private void TextBox1_PreviewTextInput(object sender, TextCompositionEventArgs e)
       {
           try
           {
               ValidateTextBox(TextBox1, e);
           }
           catch (System.Exception ex)
           {

           }

       }


       private void ValidateTextBox(System.Windows.Controls.TextBox oTextBox, System.Windows.Input.TextCompositionEventArgs e)
       {
           try
           {
               string sAfterDot = string.Empty;
               string sInputText = oTextBox.Text;
               char c = Convert.ToChar(e.Text);

               if (c == '.')
               {
                   if (oTextBox.Text.Contains("."))
                   {
                       e.Handled = true;
                   }
                   else
                   {
                       e.Handled = false;
                   }
               }
               else
               {
                   if (c == '-')
                   {
                       if (oTextBox.Text.Equals(oTextBox.SelectedText))
                       {
                           e.Handled = false;
                       }
                       else
                       {
                           if (oTextBox.Text.Contains("-"))
                           {
                               e.Handled = true;
                           }
                           else
                           {
                               if (!string.IsNullOrEmpty(oTextBox.Text) && oTextBox.Text.LastIndexOf("-") != 0)
                               {
                                   e.Handled = true;
                               }
                               else
                               {
                                   e.Handled = false;
                               }

                           }
                       }
                   }
                   else
                   {
                       if (Char.IsNumber(c))
                       {
                           e.Handled = false;
                       }
                       else
                       {
                           if (c == '-')
                           {
                               e.Handled = false;
                           }
                           else
                           {
                               e.Handled = true;
                           }
                       }
                   }
               }

               if (sInputText.Contains("."))
               {
                   sAfterDot = sInputText.Substring(sInputText.IndexOf("."), (sInputText.Length - sInputText.IndexOf(".")));
                   if (sAfterDot.Length > 2)
                   {
                       if (oTextBox.SelectionStart > sInputText.IndexOf("."))
                       {
                           e.Handled = true;
                       }
                   }
               }

               base.OnPreviewTextInput(e);

           }
           catch (System.Exception ex)
           {

           }
       }