array out of bounds exception in custom web server control.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Linq;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace SPLITTEXTCONTROL

{

[DefaultProperty("Text")]

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

public class splittext : WebControl

{

[Bindable(true)]

[Category("Appearance")]

[DefaultValue("")]

[Localizable(true)]

private TextBox _firstnametext = new TextBox();

private TextBox _lastnametext = new TextBox();

public string Text

{

get

{

String Text = _firstnametext.Text + _lastnametext.Text;

return ((Text == null) ? "[" + this.ID + "]" : Text);

}

set

{

ViewState["Text"] = value;

}

}

protected override void OnInit(EventArgs e)

{

base.OnInit(e);

_firstnametext.MaxLength = 10;

_lastnametext.MaxLength = 10;

_firstnametext.Width = new Unit("40px");

_lastnametext.Width = new Unit("40px");

}

protected override void RenderContents(HtmlTextWriter output)

{

String str = this.Text;

char[] delimiters = new char[] { ' ', ',' };

string[] parts = str.Split(delimiters);

_firstnametext.Text = parts[0];

_lastnametext.Text = parts[1];

_firstnametext.RenderControl(output);

_lastnametext.RenderControl(output);

}

}

}

 

what is wrong with my code when i try to create a web server control that parses the seperator for firstname and lastname.please give me a solution to solve this