Progress Monitor for IdealProgrammer.com

Take Swift, Intelligent, Massive, Planned, Loving, Effective (S.I.M.P.L.E.) Action to Transform Self into Ideal

Skip Repetitive Navigational Links

Home

News

Presenters

Contact

Please login

C# IsNumeric Example - ASPNET CSharp IsNumeric Syntax - Sample

Description: Here is a IsNumeric Example that illustrates the C# Syntax in ASP.NET.

Example Webform Code:

< %@ Page Language="C#" AutoEventWireup="true" CodeFile="IsNumeric.aspx.cs" Inherits="StringManipulation_IsNumeric" %>
 
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
        <asp:label ID="Label2" runat="server" Text="Label"></asp:label><br />
    </div>
    </form>
</body>
</html>

Example Code Behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
 
// This example is from http://idealprogrammer.com
// It shows how you can use IsNumeric syntax in C-Sharp ASP.NET
//****************************************************************************************
// Example #1: IsNumeric(string)
// Returns a Boolean value that indicates if the string is Numeric. 
//****************************************************************************************
 
 
public partial class StringManipulation_IsNumeric : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Example #1: IsNumeric(strField) ";
 
        string strField = "100.00";
 
 
 
 
        Label2.Text = SimulateIsNumeric.IsNumeric(strField).ToString(); //Returns True - decimals are numeric
    }
}
//----------------------------------------------------------------------------------------
//	Copyright © 2003 - 2011 Tangible Software Solutions Inc.
//	This class can be used by anyone provided that the copyright notice remains intact.
//
//	This class simulates the behavior of the classic VB 'IsNumeric' function.
//----------------------------------------------------------------------------------------
public static class SimulateIsNumeric
{
    public static bool IsNumeric(object expression)
    {
        if (expression == null)
            return false;
 
        double testDouble;
        if (double.TryParse(expression.ToString(), out testDouble))
            return true;
 
        //VB's 'IsNumeric' returns true for any boolean value:
        bool testBool;
        if (bool.TryParse(expression.ToString(), out testBool))
            return true;
 
        return false;
    }
}

Example Connection String: