validate not to enter dot as first character in textbox using c#.net

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hi i want not to enter dot as first character in textbox
i tried with this code...but the problem is it is not entering dot in entire text box...
pls solve this

C#

if (char.IsDigit(e.KeyChar) || e.KeyChar == 8 || e.KeyChar != '.')
                    {
                        e.Handled = false;
                    }
                    else
                    {
                        e.Handled = true;
                    }

Posted 20-Jul-12 18:43pm

Member 9068558

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Sandeep Mewara 21-Jul-12 1:33am

And the reason behind repost?
http://www.codeproject.com/Questions/425225/validate-to-enter-first-character-dot-in-csharp

3 solutions

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charles henington · Answer 1 · 2012-07-20T19:28:00

Solution 4

C#

TextBox textbox = sender as TexBox;
while(textbox.Text.StartsWith("."))
{
   textbox.Text = textbox.Text.Remove(0, 1);
}

Posted 20-Jul-12 19:28pm

charles henington

Nileshbhai · Answer 2 · 2012-07-20T18:51:00

Two options:

Use a NumericUpDown instead. NumericUpDown does the filtering for you, which is nice. Of course it also gives your users the ability to hit the up and down arrows on the keyboard to increment and decrement the current value.

Handle the appropriate keyboard events to prevent anything but numeric input. I've had success with this two event handlers on a standard TextBox:

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) 
        && !char.IsDigit(e.KeyChar) 
        && e.KeyChar != '.')
    {
        e.Handled = true;
    }

    // only allow one decimal point
    if (e.KeyChar == '.' 
        && (sender as TextBox).Text.IndexOf('.') > -1)
    {
        e.Handled = true;
    }
}

You can remove the check for '.' (and the subsequent check for more than one '.') if your TextBox shouldn't allow decimal places. You could also add a check for '-' if your TextBox should allow negative values.

uspatel · Answer 3 · 2012-07-20T19:27:00

Solution 2

Use as

C#

if (e.KeyChar == '.')
           {
               if(textBox1.TextLength<1)
               e.Handled = true;
           }
           else
           {
               e.Handled = false;
           }

Posted 20-Jul-12 19:27pm

uspatel