Extrapolate date values from the typed text : TextBox « ASP.net Controls « ASP.NET Tutorial






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  2. ASP.net Controls
  3. TextBox
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>

<!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>Extension Methods</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:TextBox ID="TextBox1" runat="server" /> 
            <asp:Button ID="Button1" runat="server" Text="Test" OnClick="Button1_Click" />
            <hr />
            <h2>Next day is</h2>            
            <asp:Label ID="Label1" runat="server" /> 
        </form>
    </div>
    
</body>
</html>
 
File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
using System.Text;

public static class StringExtensions
    {
        public static bool IsInt32(this string content)
        {
            int number;
            bool result = Int32.TryParse(content, out number);
            return result;
        }

        public static bool IsDate(this string content)
        {
            DateTime date;
            bool result = DateTime.TryParse(content, out date);
            return result;
        }

        public static DateTime ToDate(this string content)
        {
            DateTime date;
            bool result = DateTime.TryParse(content, out date);
            if (result)
                return date;
            else
                return DateTime.MinValue;
        }

        public static int ToInt32(this string content)
        {
            int number;
            bool result = Int32.TryParse(content, out number);
            if (result)
                return number;
            else
                return Int32.MinValue;
        }
    }

public partial class Default : System.Web.UI.Page
{
    public void Button1_Click(object sender, EventArgs e)
    {
        string content = TextBox1.Text;
        if (content.IsDate())
        {
            DateTime date = content.ToDate();
            Label1.Text = date.AddDays(1).ToString("dd MMMM yyyy");
        }
        else
        {
            Label1.Text = "Not a valid date.";
        }
    }
}








3.5.TextBox
3.5.1.Important properties, method and event of TextBox control
3.5.2.TextBox can display different types of input fields depending TextMode property
3.5.3.Show AutoComplete
3.5.4.Set the focus to a TextBox
3.5.5.Get input value from asp:textbox (VB.net)
3.5.6.Set textbox text value in button action
3.5.7.asp:TextBox changed event (C#)
3.5.8.Use if statement to check form input data (VB.net)
3.5.9.Bind string value to asp:textBox (VB.net)
3.5.10.Use Cint to convert input value in asp:textbox to integer (VB)
3.5.11.Use Convert.ToInt32 to convert input value in asp:textbox to integer (C#)
3.5.12.Check form input value and report error in case of empty input (VB.net)
3.5.13.Set AutoCompleteType
3.5.14.Convert input in TextBox into decimal
3.5.15.Extrapolate date values from the typed text