Using SpPreviledges Code in SharePoint 2010

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
namespace TestCode.TestCode
{
[ToolboxItemAttribute(false)]
public class TestCode : WebPart
{
string strError = string.Empty;
TextBox txtUserName, txtPassWord;
Button btnsave;
protected override void Render(HtmlTextWriter writer)
{
writer.Write(strError);
try
{
txtUserName.RenderControl(writer);
writer.Write("<Br />");
txtPassWord.RenderControl(writer);
writer.Write("<Br />");
btnsave.RenderControl(writer);
}
catch (Exception ex)
{
strError += ex.ToString();
}
}
protected override void CreateChildControls()
{
try
{
txtUserName = new TextBox();
this.Controls.Add(txtUserName);
txtPassWord = new TextBox();
this.Controls.Add(txtPassWord);
btnsave = new Button();
btnsave.Text = "Save Record...!";
btnsave.Click += new EventHandler(btnsave_Click);
this.Controls.Add(btnsave);
}
catch (Exception ex)
{
strError += ex.ToString();
}
}
void btnsave_Click(object sender, EventArgs e)
{
try
{
SPWeb currentWeb = SPContext.Current.Web;
SPSecurity.RunWithElevatedPrivileges(delegate()
{
using (SPSite site = new SPSite(currentWeb.Url))
{
using (SPWeb web = site.OpenWeb())
{
web.AllowUnsafeUpdates = true;
SPListItemCollection mycoll = web.Lists["Login"].Items;
SPListItem item = mycoll.Add();
item["Title"] = txtUserName.Text;
item["Password"] = txtPassWord.Text;
item.Update();
txtUserName.Text = "";
txtPassWord.Text = "";
strError += "Record Saved Succesfully";
}
}
});
}
catch (Exception ex)
{
strError += ex.ToString();
}
}
}
}