SPGridView for FBA with Context Menu's, Paging, Sorting, and Searching

OK, here is a nice chunk of code for a web part that will display the accounts within a Forms Based Authentication database. The code is complete all the bells and whistles including a context menu, paging, sorting, and searching. I couldn't get filtering to work so I opted for searching instead. It turns out searching will be a much more beneficial feature because selecting a username to filter on from a list of several hundred items would be pretty inefficient. This code should pretty much plug into a web part. I'm posting it here for reference - if someone needs clarification, post your question in the comments.

I apologize in advance for the line wrapping caused by the lack of width available in my blog. If you can't get a good copy and paste let me know and I'll put it somewhere as a text file.

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;
using System.Data;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
using System.Web.Security;

namespace FBAUserManagement
{
    [Guid("55125528-2879-4a94-b2b2-aa45d807f54d")]
    public class FBAUserManagement : System.Web.UI.WebControls.WebParts.WebPart
    {
        DataSet oDataSet = new DataSet();
        DataTable dt = new DataTable();
        DataView oView = new DataView();
        SPGridView oGrid = new SPGridView();
        Table searchTable = new Table();
        TextBox txtUserSearch = new TextBox();
        Button btnSearch = new Button();

        public FBAUserManagement()
        {

        }

        protected override void CreateChildControls()
        {
            try
            {
                //Set up the search table appearing above the SPGridView
                searchTable.ID = "navTable";
                txtUserSearch.ID = "txtUserSearch";
                btnSearch.ID = "btnSearch";
                btnSearch.Text = "Search)";
                TableRow tr1 = new TableRow();
                searchTable.Rows.Add(tr1);
                TableCell tc1 = new TableCell();
                tc1.Text = "Search (e-mail):";
                TableCell tc2 = new TableCell();
                tc2.Controls.Add(txtUserSearch);
                TableCell tc3 = new TableCell();
                tc3.Controls.Add(btnSearch);
                tr1.Cells.Add(tc1);
                tr1.Cells.Add(tc2);
                tr1.Cells.Add(tc3);
                this.Controls.Add(searchTable);

                PopulateDataset();
                oView.Table = dt;
                oGrid.ID = "UserGrid";
                oGrid.DataSource = oView;
                oGrid.AutoGenerateColumns = false;
                oGrid.AllowSorting = true;
                oGrid.Sorting += new GridViewSortEventHandler(oGrid_Sorting);

                //Add the UserName column to the DataView
                SPMenuField colMenu = new SPMenuField();
                colMenu.HeaderText = "User Name";
                colMenu.TextFields = "UserName";
                colMenu.MenuTemplateId = "UserNameListMenu";
                colMenu.NavigateUrlFields = "UserName";
                colMenu.NavigateUrlFormat = "do.aspx?p={0}";
                colMenu.TokenNameAndValueFields = "NAME=UserName";
                colMenu.SortExpression = "UserName";

                //Build the Contenx Menu
                //Images used are all native to SharePoint
                MenuTemplate UserNameListMenu = new MenuTemplate();
                UserNameListMenu.ID = "UserNameListMenu";

                MenuItemTemplate userDisable = new MenuItemTemplate("Disable Account", "/_layouts/images/ServiceNotInstalled.gif");
                userDisable.ID = "userDisable";
                userDisable.ClientOnClickNavigateUrl = "do.aspx?this=%EDIT%that=%NAME%";
                UserNameListMenu.Controls.Add(userDisable);

                MenuItemTemplate userUnlock = new MenuItemTemplate("Unlock Account", "/_layouts/images/ServiceInstalled.gif");
                userUnlock.ID = "userUnlock";
                userUnlock.ClientOnClickNavigateUrl = "do.aspx?this=%EDIT%that=%NAME%";
                UserNameListMenu.Controls.Add(userUnlock);

                MenuItemTemplate userReset = new MenuItemTemplate("Reset Password", "/_layouts/images/recurrence.gif");
                userReset.ID = "userReset";
                userReset.ClientOnClickNavigateUrl = "do.aspx?this=%EDIT%that=%NAME%";
                UserNameListMenu.Controls.Add(userReset);

                this.Controls.Add(UserNameListMenu);
                oGrid.Columns.Add(colMenu);

                //Add E-mail Column
                BoundField emailLink = new BoundField();
                emailLink.DataField = "Email";
                emailLink.HeaderText = "E-mail";
                emailLink.SortExpression = "Email";
                oGrid.Columns.Add(emailLink);

                //Add Locked Out Column
                CheckBoxField isLockedOut = new CheckBoxField();
                isLockedOut.DataField = "IsLockedOut";
                isLockedOut.HeaderText = "Locked Out";
                isLockedOut.SortExpression = "IsLockedOut";
                oGrid.Columns.Add(isLockedOut);

                //Add Last Login Column
                BoundField LastLogin = new BoundField();
                LastLogin.DataField = "LastLoginDate";
                LastLogin.HeaderText = "Last Login";
                LastLogin.SortExpression = "LastLoginDate";
                oGrid.Columns.Add(LastLogin);

                //Add Last Password Change Column
                BoundField LastPasswordChange = new BoundField();
                LastPasswordChange.DataField = "LastPasswordChangedDate";
                LastPasswordChange.HeaderText = "Last Password Change";
                LastPasswordChange.SortExpression = "LastPasswordChangedDate";
                oGrid.Columns.Add(LastPasswordChange);

                this.Controls.Add(oGrid);

                //Turn on Paging and add event handler
                oGrid.PageSize = 10;
                oGrid.AllowPaging = true;
                oGrid.PageIndexChanging += new GridViewPageEventHandler(oGrid_PageIndexChanging);
                oGrid.PagerTemplate = null; // Must be called after Controls.Add(oGrid)

                //Recreate current sort if needed
                if (ViewState["SortDirection"] != null && ViewState["SortExpression"] != null)
                {
                    //We have sorting so it needs to be preserved
                    oView.Sort = ViewState["SortExpression"].ToString() + " " + ViewState["SortDirection"].ToString();
                }

                base.CreateChildControls();
            }
            catch (Exception e)
            {
                Page.Response.Write(e.ToString());
            }
        }

        void oGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            oGrid.PageIndex = e.NewPageIndex;
            oGrid.DataBind();
        }

        private void ApplyFilter()
        {
            if (txtUserSearch.Text != "")
            {
                oView.RowFilter = string.Format("Email LIKE '%{0}%'", txtUserSearch.Text);
            }
        }

        protected override void Render(HtmlTextWriter writer)
        {
            //If there is a filter it must be applied before binding
            ApplyFilter();
            oGrid.DataBind();
            base.Render(writer);
        }

        private void oGrid_Sorting(object sender, GridViewSortEventArgs e)
        {
            //Sorting Logic
            string lastExpression = "";
            if (ViewState["SortExpression"] != null)
                lastExpression = ViewState["SortExpression"].ToString();

            string lastDirection = "asc";
            if (ViewState["SortDirection"] != null)
                lastDirection = ViewState["SortDirection"].ToString();

            string newDirection = "asc";
            if (e.SortExpression == lastExpression)
                newDirection = (lastDirection == "asc") ? "desc" : "asc";

            ViewState["SortExpression"] = e.SortExpression;
            ViewState["SortDirection"] = newDirection;

            oView.Sort = e.SortExpression + " " + newDirection;
            oGrid.DataBind();

        }

        private void PopulateDataset()
        {
            //Pull each user in the membership into a DataSet
            oDataSet.ExtendedProperties.Add("ID", "MyDataSet");
            dt = oDataSet.Tables.Add("Users");
            MembershipUserCollection muc;
            muc = Membership.GetAllUsers();
            int counter = 0;
            dt.Columns.Add("ID", Type.GetType("System.Int32"));
            dt.Columns.Add("UserName", Type.GetType("System.String"));
            dt.Columns.Add("Email", Type.GetType("System.String"));
            dt.Columns.Add("isLockedOut", Type.GetType("System.Boolean"));
            dt.Columns.Add("LastLoginDate", Type.GetType("System.DateTime"));
            dt.Columns.Add("LastPasswordChangedDate", Type.GetType("System.DateTime"));
            foreach (MembershipUser mu in muc)
            {
                DataRow dr;
                dr = dt.NewRow();
                dr["ID"] = counter;
                dr["UserName"] = mu.UserName;
                dr["Email"] = mu.Email;
                dr["isLockedOut"] = mu.IsLockedOut;
                dr["LastLoginDate"] = mu.LastLoginDate;
                dr["LastPasswordChangedDate"] = mu.LastPasswordChangedDate;
                dt.Rows.Add(dr);
                counter++;
            }

        }
    }
}