Textbox validation in ASP.NET

[Kasper]

Hello to all,
I am last year B.Sc.I.T. student. I am working on one live project which has asp.net as front end language. I have created textbox for entering Mobile number. I want to prevent the user from entering alphabets and specials characters in a textbox. Can anyone tell me the code to prevent the user from entering alphabets and specials characters in a textbox. Please help me.
Thanks in advanced.

[Praetor]

Hey it is very easy process to prevent other user from entering alphabates in Textbox. You have to use Regular expression to do this. You can use following code to do this.

<asp:TextBox ID="TB1" runat="S" Style="z-index: 150; left: 260px; position: absolute;
top: 283px" ValidationGroup="C"></asp:TB>

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="S" ControlToValidate="TB1"
ErrorMessage="Only Numbers" Style="z-index: 110; left: 524px; position: absolute;
top: 285px" ValidationExpression="^\d+$" ValidationGroup="C"></asp:RegularExpressionValidator>

[Katty]

Following code allowed you to prevent user from entering alphabetics or any special characters.

   
Private Sub TB1(ByVal sender As Object, ByVal w As System.Windows.Forms.KeyPressEventArgs) Handles TB1
If (Microsoft.VisualBasic.Asc(w.KeyChar) < 48) _Or (Microsoft.VisualBasic.Asc(w.KeyChar) > 57) Then
w.H = True
End If
If (Microsoft.VisualBasic.Asc(w.KeyChar) = 8) Then
w.H = False
End If
End Sub

[kelfro]

You can validate number using following code.

<script type="text/asp.net" >
function validateNumber(e)
{

    var k;
    if(window.event)
    {
        k = window.event.kCode;
    }
    else
    {
        k = e.which; 
    }
    if (!((k >47 && k <=57) || ( k ==8)|| ( k == 13) || ( k == 9) ||( k == 0)||(k ==127)))
    {
        alert("  enter numbers between 0 to 9 ");
        return false;
    }
    else
        return true;
}

function validateAlphabet(e)
{

    var k;
    if(window.event)
    {
        k = window.event.keyCode;
    }
    else
    {
        k = e.which; 
    }
    
    if (!((k >96 && k <=122) || (k >64 && k <=90) || ( k ==8)|| ( k == 13) || ( k == 9) ||( k == 0)||(k==127)))
    {
        alert(" You can enter only number ");
        return false;
    }
    else
        return true;
}
</script>

c#:

protected void Page_Load(object sender, EventArgs e)
    {
        txtNumber.Attributes.Add("press1", "return validateNumber(event)");
        txtAlphabet.Attributes.Add("press1", "return validateAlphabet(event)");
    }

[Zecho]

I use the following code in my6 project for same purpose as yours and it works right in my project. I think you also use this code to do this. Just copy this code and save it in your project.

#Region "TextBox Events"

Private Sub tRNo_KP(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tRNo_KP
Try
If C.IsLetterOrDigit(e.KeyChar) = False And C.IsControl(e.KeyChar) = False Then
e.Handled = True
End If
Catch ex As Exception
ShowException(ex.Message, MESSAGEBOX_TITLE, ex)
End Try
End Sub
#End Region