CODEWITHSUNDEEP
c#
user162558
user162558

Reputation: 259

e-mail validation on windows form

i am using windows forms.

I just want to validate my textbox ( or masked textbox ) for e-mail id.

Can any one tell me the idea for that?

Upvotes: 2

Views: 32733

Answers (6)

Kelvin Castro
Kelvin Castro

Reputation: 151

I recommend you use this way and it's working well for me.

/* Add this reference */

using System.Text.RegularExpressions;

---------------------------

if (!string.IsNullOrWhiteSpace(txtEmail.Text))
{
    Regex reg = new Regex(@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*");
    if (!reg.IsMatch(txtEmail.Text))
    {
        Mensaje += "* El email no es válido. \n\n";
        isValid = false;
    }
}

Upvotes: 1

user2846044
user2846044

Reputation:

Try this: 

private void emailTxt_Validating(object sender, CancelEventArgs e)

{

System.Text.RegularExpressions.Regex rEmail = new    System.Text.RegularExpressions.Regex(@"^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");

        if (emailTxt.Text.Length > 0 && emailTxt.Text.Trim().Length != 0)
        {
            if (!rEmail.IsMatch(emailTxt.Text.Trim()))
            {
                MessageBox.Show("check email id");
                emailTxt.SelectAll();
                e.Cancel = true;
            }
        }
    }

Upvotes: 1

sudeep
sudeep

Reputation: 126

string email=textbox1.text;

System.Text.RegularExpressions.Regex expr= new System.Text.RegularExpressions.Regex(@"^[a-zA-Z][\w\.-]{2,28}[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");

`if (expr.IsMatch(email))
            MessageBox.Show("valid");

        else MessageBox.Show("invalid");`

Upvotes: 1

maxy
maxy

Reputation: 438

try regular expression 

@"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"

or check your email address in code

string email=textbox1.text;
if(email.lastindexof("@")>-1)
{
//valid
}
else
{

}

Upvotes: 2

Frank Bollack
Frank Bollack

Reputation: 25166

You can use the constructor of the System.Net.Mail.MailAdress class that represents mail addresses.

Try to initialize an instance with your string and catch the exception, that is thrown if the validation failed. Something like this:

try
{
   new System.Net.Mail.MailAddress(this.textBox.Text);
}
catch(ArgumentException)
{
   //textBox is empty
}
catch(FormatException)
{
   //textBox contains no valid mail address
}

Upvotes: 4

SteckCorporation
SteckCorporation

Reputation: 51

Try to use regular expression like @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"

Upvotes: 4

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