Allow Only Number To TextBox Avoid Character
Textbox Enter Input Only Allowed Number But Not Allow Character RegularExpression Validation Using Asp.Net C#.
DEMO
Textbox Enter Input Only Allowed Number But Not Allow Character RegularExpression Validation Using Asp.Net C#.
DEMO
HTML CODING
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:TextBox ID="txtNumber" runat="server" Height="16px" AutoPostBack="True" ForeColor="#CC3300" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
</form>
</body>
</html>
C# CODING
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
if (System.Text.RegularExpressions.Regex.IsMatch(txtNumber.Text, "[^0-9]"))
{
Response.Write("<script>alert('Only Allowed Numbers')</script>");
int count = txtNumber.Text.Count();
txtNumber.Text = txtNumber.Text.Remove(txtNumber.Text.Length - count);
}
else
{
Response.Write("<script>alert('Valid Numbers')</script>");
}
}
}
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