C-Sharp IsNumeric Example | ASP.NET C# IsNumeric Syntax | Source Code

Posted by on Friday, April 1, 2011 · Leave a Comment 

C-Sharp IsNumeric Example | ASP.NET C# IsNumeric Syntax | Source Code

Purpose: – Here is a that illustrates the .


View Other C-Sharp ASP.NET Source Code Examples »



Step 1: Click on C# to Cut-n-paste code into IsNumeric.aspx.cs

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;
    }
}

Step 2: Click on XML to Cut-n-paste code into IsNumeric.aspx

< %@ 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>

Prerequistes:

  1. Install Visual Web Developer 2010
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

CS Syntax String Manipulation IsNumeric
CS Syntax String Manipulation IsNumeric
  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for Language
    • name of Web Site could be CSharp_ASPNET_Syntax.
  3. Add New folder named “StringManipulation”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Web Form Named IsNumeric.aspx to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be IsNumeric.aspx
  5. Click on C-Sharp in step 1 at the top of this page to copy code into web form IsNumeric.aspx
  6. Click on XML in step 2 above to copy code into code-behind IsNumeric.aspx.cs
  7. Right-click on IsNumeric.aspx in solution explorer and select view in browser

Filed under Code Samples · Tagged with , , , , , ,