Custom WebControl

Located in the App_Code folder 

using System.ComponentModel;

using System.Drawing;

using System.Linq;

using System.Security.Permissions;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace CustomControls

[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]

[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]

[DefaultProperty("Text")]

[ToolboxData("<{0}:NumbericTextBox runat=server>")]

//--public class NumbericTextBox : TextBox //- When This used it does not call the javascript

public class NumbericTextBox : CompositeControl

[Bindable(true)]

[Category("Appearance")]

[DefaultValue("")]

[Localizable(true)]

public override string ID

set

base.ID = value;

public override Unit Height

get

return base.Height;

set

base.Height = value;

public override Unit Width

get

return base.Width;

set

base.Width = value;

#region OnPreRender

///

protected override void OnPreRender(EventArgs e)

base.OnPreRender(e);

string resourceName = "CustomControls.validatenumeric.js";

ClientScriptManager cs = this.Page.ClientScript;

cs.RegisterClientScriptResource(typeof(CustomControls.NumbericTextBox), resourceName);

#endregion OnPreRender

protected override void CreateChildControls()

this.Controls.Clear();

TextBox txtBox1 = new TextBox();

//- Numeric TextBox

txtBox1.ID = this.ID;

txtBox1.Width = this.Width;

txtBox1.Height = this.Height;

txtBox1.ToolTip = "Numeric Value Only";

txtBox1.Attributes.Add("onkeypress", "return IsNumbericValue(event)");

txtBox1.Style.Add("text-align", "right");

//- Add the control to the environment

this.Controls.Add(txtBox1);

function IsNumbericValue(evt) {

var charCode = (evt.which) ? evt.which : event.keyCode;

if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57)) {

return false;

else {

// If the number field already has . then don't allow to enter . again.

if (evt.target.value.search(/\./) > -1 && charCode == 46) {

return false;

return true;