Eamil , Phone number and String Validation in Windows Forms

Today I show you how to Validate Email address,Phone or mobile numbers and String validation in Winodows froms c#.

As we in asp.net there is a validation control that can easily validate required String.

Here but use regex Expressions for Email Validations .It is Easy and most widely use Technique .

So let start,
first you have to drag drop Text box And Button on Form Designer Surface .

Created a method like below

bool IsvalidEmail(TextBox Email)
        {
                        if (Email.Text.Trim() != "")
            {
Match rex = Regex.Match(Email.Text.Trim(' '), "^([0-9a-zA-Z]([-.\\w]*[0-9a-zA-Z])*@([0-9a-zA-Z]"+
        "[-\\w]*[0-9a-zA-Z]\\.)[a-zA-Z]{2,3})$", RegexOptions.IgnoreCase);
                if (rex.Success == false)
                {
                    MessageBox.Show("Please Enter a valid Email-Address ",
                    "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    Email.Focus();
                    return false;
                }
                else
                {
                    return true;
                }
            }
            else

            {
                return true;

            }
        }

And Write this Code In OnClick Eent of Button

        private void btShow_Click(object sender, EventArgs e)
        {
            bool Vaild = IsvalidEmail(txtEmail);
            if (Vaild)
            {
                MessageBox.Show("Email address is Correct");
            }

        }

Little Description about REGX

Patter	Description
(@)	Match the @ character. This is the first capturing group.
(.+)	Match one or more occurrences of any character. This is the second capturing group.
$	End the match at the end of the string.

|(([0-9a-zA-Z] If the first character is not a quotation mark, match any alphabetic
character from a to z or any numeric character from 0 to 9.

AND NOW PHONE NUMBER and STRING VALIDATIONS

It is very Simple and Easy you just Write Below code on KEY_Press Event of a textbox.

private void txtCellNumber_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsNumber(e.KeyChar) && e.KeyChar != (char)Keys.Back && e.KeyChar != '+')
            {
                e.Handled = true;
            }
        }

For String

private void txtStringValue_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsLetter(e.KeyChar))
            {
                e.Handled = true;
            }
        }

Download Soucre Code

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Jul 26, 2012