How to Validate the Email id Using Asp.net

Question

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Hi Friends;

I have Small Problem .i m Validate the Email id with (-).
my code Not working

My Code below :

C#

if (!string.IsNullOrEmpty(txtEmailID.Text.Trim()))
                {
                    // Email Validation using regular expressions
                    //string pattern = @"^[a-z][a-z|0-9|]*([_][a-z|0-9]+)*([.][a-z|0-9]+([_][a-z|0-9]+)*)*([.][a-z|0-9]+([_][a-z|0-9]+)*)?@[a-z|0-9|]*[a-z|0-9|][a-z|0-9|]*\.([a-z]" +
                    // @"[a-z|0-9]*(\.[a-z][a-z|0-9]*)?)$";
                    string pattern = @"/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i";


                    System.Text.RegularExpressions.Match match = System.Text.RegularExpressions.Regex.Match(txtEmailID.Text.Trim(), pattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase);
                    if (!match.Success)
                    {
                        MessageBox.Show("Please enter a valid Email ID", Common.MSGBOX_TITLE, MessageBoxButtons.OK, MessageBoxIcon.Warning);
                        txtEmailID.Focus();
                        return false;
                    }
                }

Plz help Me

Regards
sathya.

Posted 4-Apr-12 21:55pm

SathyaRaju

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Comments

Kiirrii 5-Apr-12 4:00am

why dont u use validating controls ..

SathyaRaju 5-Apr-12 4:04am

i m using the windows application

5 solutions

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SruthiR · Answer 1 · 2012-04-04T22:35:00

Solution 2

try the below pattern.

string strPattern = @"\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";

Posted 4-Apr-12 22:35pm

SruthiR

Updated 4-Apr-12 23:28pm

v2

Mohamed Mitwalli · Answer 2 · 2012-04-04T23:26:00

Hi ,
try this one

XML

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
         ErrorMessage=" your Error message" ControlToValidate="TextBox1"
         Display="Dynamic" ForeColor="#FF3300" SetFocusOnError="True"
         ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>

you can also use it code behind

C#

RegularExpressionValidator reg = new RegularExpressionValidator();
reg.ID = "RegularExpressionValidator1";
reg.ControlToValidate = "TextBox1";
reg.Display = ValidatorDisplay.Dynamic;
reg.ErrorMessage = "your Error message";
reg.SetFocusOnError = true;
reg.ValidationExpression = @"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*";
form1.Controls.Add(reg);
reg.Validate();

Best Regards
M.Mitwalli

santosh_k · Answer 3 · 2012-04-05T01:53:00

VB

<asp:Label id="lblEmail"
Text="Email ID" runat="server" />

<asp:TextBox ID="txtEmail"
MaxLength="50" runat="server" />
<asp:RequiredFieldValidator ID="txtEmailValidator"
ControlToValidate="txtEmail"
Text="*" ErrorMessage="Email is Missing"
runat="server" />

<asp:RegularExpressionValidator ID="RegularExpressionValidator1"
ControlToValidate="txtEmail"
Text="Invalid Email Address"
ValidationExpression="^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)
|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$" runat="server" />

OriginalGriff · Answer 4 · 2012-04-04T22:09:00

Solution 1

Try this Regex:

([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})

It is taken directly from the Expresso Expression Library.
Get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions.

Posted 4-Apr-12 22:09pm

OriginalGriff

Comments

SathyaRaju 5-Apr-12 4:17am

i get the error.......like too many

OriginalGriff 5-Apr-12 4:24am

Sorry? Please try to explain in a little more detail.

SathyaRaju 5-Apr-12 4:28am

too many parameter not correct format....

OriginalGriff 5-Apr-12 4:32am

Did you insert it as the pattern string?
If so, show your code.

nivabeath · Answer 5 · 2014-03-24T20:47:00

Solution 5

C#

pattern = "^([0-9a-zA-Z]([-\\.\\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\\w]*[0-9a-zA-Z]\\.)+[a-zA-Z]{2,9})$"


if (Regex.IsMatch(TextBox1.Text , pattern))
{
    Label2.Text = "Valid Email address ";
}

Full source code.. Asp.Net email Validation

Niva

Posted 24-Mar-14 20:47pm

nivabeath