Email validation in Windows Application using C# and VB.Net

Hey pujandoshi,

Please refer below sample.

Code

C#

private void btnValidate_Click(object sender, EventArgs e)
{
    System.Text.RegularExpressions.Regex regx = new System.Text.RegularExpressions.Regex(@"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
    if (regx.IsMatch(txtEmail.Text.Trim()))
    {
        MessageBox.Show("Valid Email.");
    }
    else
    {
        MessageBox.Show("Invalid Email.");
    }
}

VB.Net

Private Sub btnValidate_Click(sender As System.Object, e As System.EventArgs) Handles btnValidate.Click
    Dim regx As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex("^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$")
    If regx.IsMatch(txtEmail.Text.Trim()) Then
        MessageBox.Show("Valid Email.")
    Else
        MessageBox.Show("Invalid Email.")
    End If
End Sub

Screenshots