Email verification in C# winforms

Question

So for the Email, I want every user that register to have a @ in their Email. Otherwise, it will prompt out an error saying that Email is invalid.

For example, if the user enter "Johngmail.com" there will be an error because it doesnt have "@".

So the correct email would be "[email protected]".

Sachin Singh · Answer

.NET already have a mail class, which validates the mail format, like @ and dot(.), so directly use that. create a class "common" anywhere in your project and copy paste below code public class Common { public bool IsValidEmailAddress ( string email) { try { MailAddress ma = new MailAddress (email); return true ; } catch { return false ; } } } now use this method, in your form private void btnSendMail(eventArgs......) { Common com= new Common(); if (com.IsValidEmailAddress(txtEmail.Text)) { // send Mail } else { MessageBox.Show( "Email is not valid" ); } }

Vikas Panwar · Answer

Hi, You Can Use Like As public int ValidateEmailId( string emailId) { System.Text.RegularExpressions.Regex rEMail = 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 (emailId.Length > 0) { if (!rEMail.IsMatch(emailId)) { return 0; } else { return 1; } } return 2; }

Srinivasan Ramamoorthi · Answer

Use regular expression to validate. Check this link https://stackoverflow.com/questions/16167983/best-regular-expression-for-email-validation-in-c-sharp

Jignesh Kumar · Answer

Hi Samuel, Please refer this forum, Its already answer in our forum group which will help you out, https://www.c-sharpcorner.com/forums/how-to-validate-email-id-entered-in-windows-form-textbox