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In most cases asp.net C# VB.Net developers need to check or validate user input for integer, decimal & DateTime. Asp.net C# provides us an easy way to validate those user inputs from server side. Here in this small article i will show you how one can validate using Asp.Net. Basically TryParse boolean returntype method will help us to check user inputs. It Converts the specified string representation of a Date and time / Integer / Decimal to its DateTime equivalent Integer equivalent Decimal equivalent and returns a value that indicates whether the conversion succeeded or not. In the below example i will show you to validate DateTime, Integer & Decimal values validation.
The output like:
To do that add a page in your project & paste the below HTML MARKUP:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="validate_int_datetime.aspx.cs" Inherits="validate_int_datetime" %>
<!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>How to validate integer double numeric datetime in asp.net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lbl_integer" runat="server" Text="Enter Integer: "></asp:Label>
<asp:TextBox runat="server" ID="txt_integer"></asp:TextBox>
<asp:Button ID="cmd_integer" runat="server" Text="Click to check" OnClick="cmd_integer_Click" />
<asp:Label ID="lbl_integer_result" runat="server" Font-Bold="True"></asp:Label>
<br />
<hr />
<br />
<asp:Label ID="lbl_decimal" runat="server" Text="Enter Decimal: "></asp:Label>
<asp:TextBox runat="server" ID="txt_decimal"></asp:TextBox>
<asp:Button ID="cmd_decimal" runat="server" Text="Click to check" OnClick="cmd_decimal_Click" />
<asp:Label ID="lbl_decimal_result" runat="server" Font-Bold="True"></asp:Label>
<br />
<hr />
<br />
<asp:Label ID="lbl_Datetime" runat="server" Text="Enter datetime: "></asp:Label>
<asp:TextBox runat="server" ID="txt_Datetime"></asp:TextBox>
<asp:Button ID="cmd_Datetime" runat="server" Text="Click to check" OnClick="cmd_Datetime_Click" />
<asp:Label ID="lbl_datetime_result" runat="server" Font-Bold="True"></asp:Label>
</div>
</form>
</body>
</html>
Now in codebehind write the below code:using System;
public partial class validate_int_datetime : System.Web.UI.Page
{
Int32 Check_Integer;
decimal check_decimal;
DateTime check_Datetime;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void cmd_integer_Click(object sender, EventArgs e)
{
if(Int32.TryParse(txt_integer.Text,out Check_Integer))
lbl_integer_result.Text="Integer Validation Successfull.";
else
lbl_integer_result.Text = "Invalid Integer!!";
}
protected void cmd_decimal_Click(object sender, EventArgs e)
{
if (decimal.TryParse(txt_decimal.Text, out check_decimal))
lbl_decimal_result.Text = "Decimal Validation Successfull.";
else
lbl_decimal_result.Text = "Invalid Decimal!!";
}
protected void cmd_Datetime_Click(object sender, EventArgs e)
{
if (DateTime.TryParse(txt_Datetime.Text, out check_Datetime))
lbl_datetime_result.Text = "Datetime Validation Successfull.";
else
lbl_datetime_result.Text = "Invalid Datetime!!";
}
}
Check the code how i use TryParse to validate datatypes.Hope now you can validate any primitive datattypes using asp.net.
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