How to validate the textbox for below conditions:->Textbox should not allow Null value & it allow Double values ->It does not allow any string values.

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->Textbox should not allow Null value & it allow Double values
->It does not allow any string values.

Posted 10-Jul-14 18:16pm

Muthu Kumar K

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Yogesh Kumar Tyagi · Answer 1 · 2014-07-10T18:54:00

Solution 2

Use Regular Expression

^[0-9]([.,][0-9]{1,3})?$ it allow only numbers

Posted 10-Jul-14 18:54pm

Yogesh Kumar Tyagi

srinivas vadepally · Answer 2 · 2014-07-10T19:22:00

Solution 3

Muthu use numeric textbox..
Create Numeric Textbox[^]
How to use only numeric value in a textbox[^]

Posted 10-Jul-14 19:22pm

srinivas vadepally

*Suvabrata Roy* · Answer 3 · 2014-07-10T18:40:00

Solution 1

Hi,

As you are in windows use this : http://msdn.microsoft.com/en-us/library/vstudio/kkx4h3az(v=vs.100).aspx[^]
it will take only numeric not strings

To eliminate null or blank you can use : Validate user input in Windows Forms[^]

Posted 10-Jul-14 18:40pm

Suvabrata Roy

vidin · Answer 4 · 2014-07-11T00:58:00

// this code are called in textbox keypress event
public void IntegerOnly(object sender, KeyPressEventArgs e)
        {
            TextBox tb = (TextBox)sender;
            if ((e.KeyChar < 48 || e.KeyChar > 57) && (e.KeyChar != 8 & e.KeyChar != 13 & e.KeyChar != 46) && (e.KeyChar != 22) && (e.KeyChar != 3))
            {
                e.Handled = true;
            }
            else
            {
                if (tb.Text.Length > 9 && e.KeyChar != 8 && e.KeyChar != 13 && e.KeyChar != 46)
                {
                    e.Handled = true;
                }
            }
        }



        public void TwoDecimalOnly(object sender, KeyPressEventArgs e)
        {
            TextBox tb = (TextBox)sender;
            if ((e.KeyChar < 48 || e.KeyChar > 57) && (e.KeyChar != 8 & e.KeyChar != 13 & e.KeyChar != 46) && (e.KeyChar != 22) && (e.KeyChar != 3))
            {
                e.Handled = true;
            }
            if (tb.Text.Contains("."))
            {
                if (e.KeyChar == 46)
                    e.Handled = true;
                int dot = tb.Text.IndexOf(".");
                if ((tb.Text.Substring(dot).Length > 2 && e.KeyChar != 8 && e.KeyChar != 13))
                    e.Handled = true;
            }
            else
            {
                if (tb.Text.Length > 9 && e.KeyChar != 8 && e.KeyChar != 13 && e.KeyChar != 46)
                {
                    e.Handled = true;
                }
            }
        }


        public void ThreeDecimalOnly(object sender, KeyPressEventArgs e)
        {
            TextBox tb = (TextBox)sender;
            if ((e.KeyChar < 48 || e.KeyChar > 57) && (e.KeyChar != 8 & e.KeyChar != 13 & e.KeyChar != 46) && (e.KeyChar != 22) && (e.KeyChar != 3))
            {
                e.Handled = true;
            }
            if (tb.Text.Contains("."))
            {
                if (e.KeyChar == 46)
                    e.Handled = true;
                int dot = tb.Text.IndexOf(".");
                if ((tb.Text.Substring(dot).Length > 3 && e.KeyChar != 8 && e.KeyChar != 13))
                    e.Handled = true;
            }
            else
            {
                if (tb.Text.Length > 9 && e.KeyChar != 8 && e.KeyChar != 13 && e.KeyChar != 46)
                {
                    e.Handled = true;
                }
            }
        }