Meeting WorkSpace Webpart :- Gets All Meeting Task

This WebPart is developed get all the Task which are added in a Decision Meeting Workspace template selected. since SharePoint does not provide any out-Of-Box functionality to segregate this vital information.
hence a custom WebPart was developed by my associate.
Initially all the related reference /namespaces are added , despite of Microsoft.sharepoint;
We also be needing :
using Microsoft.SharePoint.Administration;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
using Microsoft.SharePoint.Meetings;
//Core Code for WebPart.
public class MeetingWorkspace : System.Web.UI.WebControls.WebParts.WebPart
{
//Initilization
SPGridView m_grid;
SPWeb web1 = SPContext.Current.Web;
ObjectDataSource objDataSource = new ObjectDataSource();
//Override Methods
protected override void CreateChildControls()
{
try
{
Type type = this.GetType();
objDataSource.ID = "mTaskDS";
objDataSource.TypeName = type.AssemblyQualifiedName;
objDataSource.SelectMethod = "GetListItems";
objDataSource.ObjectCreating += new ObjectDataSourceObjectEventHandler(objDataSource_ObjectCreating);
this.Controls.Add(objDataSource);
#region SPGridView Details
m_grid = new SPGridView();
m_grid.AutoGenerateColumns = false;
m_grid.Columns.Clear();
HyperLinkField meetingName = new HyperLinkField();
meetingName.HeaderText = "Meeting Name";
meetingName.DataTextField = "MeetingName";
string[] strmeetingName = { "MeetingSiteUrl" };
meetingName.DataNavigateUrlFields = strmeetingName;
meetingName.DataNavigateUrlFormatString = "{0}";
m_grid.Columns.Add(meetingName);
BoundField t = new BoundField();
t.DataField = "Title";
t.HeaderText = "Task Title";
m_grid.Columns.Add(t);
BoundField b = new BoundField();
b.DataField = "Status";
b.HeaderText = "Status";
b.HtmlEncode = false;
b.SortExpression = "Status";
m_grid.Columns.Add(b);
BoundField colStartDate = new
BoundField();
colStartDate.DataField = "StartDate";
colStartDate.HeaderText = "Start Date";
colStartDate.HtmlEncode = false;
m_grid.Columns.Add(colStartDate);
BoundField colDueDate = new
BoundField();
colDueDate.DataField = "DueDate";
colDueDate.HeaderText = "Due Date";
colDueDate.HtmlEncode = false;
m_grid.Columns.Add(colDueDate);
m_grid.DataSourceID = "mTaskDS";
m_grid.AllowGrouping = true;
m_grid.AllowGroupCollapse = true;
m_grid.GroupField = "MeetingName";
m_grid.GroupFieldDisplayName = "MeetingName";
m_grid.AllowSorting = true;
m_grid.AllowPaging = true;
Controls.Add(m_grid);
m_grid.DataBind();
m_grid.PageSize = 3;
m_grid.PageIndexChanging += new GridViewPageEventHandler(m_grid_PageIndexChanging);
m_grid.PagerTemplate = null;
#endregion

base.CreateChildControls();
}
catch(Exception ex) { //Error }
}
//Data View Method
public DataView GetListItems()
{
DataView dv = new DataView();
DataTable dt = new DataTable();
try
{
string rowFilter = "AssignedTo = '" + SPContext.Current.Web.CurrentUser.Name + "'";
foreach (SPWeb web in web1.Webs)
{
if (SPMeeting.IsMeetingWorkspaceWeb(web))
{
SPMeeting meeting = SPMeeting.GetMeetingInformation(web);
// A Meeting Workspace has a Meeting Series list with information about all meetings in the workspace.
SPList meetings = web.Lists["Meeting Series"];
// Get the meeting items that fit the criteria.
SPListItemCollection items = meetings.Items;
// Now extract useful information about each meeting.
foreach (SPListItem item in items)
{
int instanceID = (int)item["InstanceID"];
SPQuery query =new SPQuery();
query.MeetingInstanceId = instanceID;
query.Query = @"<Query> <Where><IsNotNull> <FieldRefName='ID' /> </IsNotNull></Where></Query>" ;
SPList list = web.Lists["Tasks"];
DataTable dtMItems = list.GetItems(query).GetDataTable();
if (dtMItems.Columns["MeetingName"] == null)
{
dtMItems.Columns.Add("MeetingName");
dtMItems.AcceptChanges();
}
if (dtMItems.Columns["MeetingSiteUrl"] == null)
{
dtMItems.Columns.Add("MeetingSiteUrl");
dtMItems.AcceptChanges();
}
foreach (DataRow dr in dtMItems.Rows)
{
dr["MeetingName"] = item.Title;
dr["MeetingSiteUrl"] = web.Url + "/default.aspx?InstanceID=" + instanceID.ToString();
dtMItems.AcceptChanges();
}
dt.Merge(dtMItems);
} } }
dv = new DataView(dt, rowFilter, null, DataViewRowState.CurrentRows);
}
catch (Exception ex) {//Error}
return dv;
}
//Handler
private void objDataSource_ObjectCreating(object sender, ObjectDataSourceEventArgs e)
{
e.ObjectInstance = this;
}
private void m_grid_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
try
{
m_grid.PageIndex = e.NewPageIndex;
m_grid.AllowGrouping = true;
m_grid.AllowGroupCollapse = true;
m_grid.GroupField = "MeetingName";
m_grid.GroupFieldDisplayName = "MeetingName";
m_grid.DataBind();
}
catch (Exception ex) {//Error }
}
}

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Special Thanks: Ganesh Bankar