Stored procedure executing but not able to populate gridview

I need to populate a gridview upon user login. I have written a stored procedure for populating that gridview using login credentials... my stored procedure is working ... I'm able to get the output in SQL Server but once I use login id and password and logs in gridview isn't getting populated... please help me out..

This is my codes and stored procedure

Stored procedure:

ALTER PROCEDURE [dbo].[GetManager]

@EmpName nvarchar(50)

AS

Select TaskName, DueDate, Description, AssignBy, AssignTo, Status, PercentageComplete

From dbo.Task, dbo.EmployeeData

Where AssignTo in (Select EmpName From EmployeeData Where Manager = 'RaghavendraS')

And AssignBy in (Select EmpName From EmployeeData Where Manager = 'RaghavendraS')

And EmpName = @EmpName;

I'm using 3 layered architecture.. wich has DTO,DAL and business layer.. I'm calling data source through these layers.

Backend code

DAL :

public DataSet GetManager(MTMSDTO M)
{
DBAccess db = new DBAccess();
SqlParameter objParam = new SqlParameter("@EmpName", M.EmpName);
objParam.Direction = ParameterDirection.Input;
objParam.Size = 50;

db.Parameters.Add(objParam);
return db.ExecuteDataSet("GetManager");
}

BusinessLayer :

public DataSet GetManager(MTMSDTO M)
{
MTMSAccess obj = new MTMSAccess();
return obj.GetManager(M);
}

Gridview calling function using stored procedure:



protected void GrdManager()
{
MTMSDTO objc = new MTMSDTO();
{
objc.EmpName = Convert.ToString(Session["EmpName"]);
DataSet GrdMA = obj.GetManager(objc);
DataView GrdMan = new DataView();
GrdMan.Table = GrdMA.Tables[0];
GridViewTTlist.DataSource = GrdMan;
GridViewTTlist.DataBind();
}
}

here is aspx code for grid view 
AutoGenerateColumns="False" BackColor="White" BorderColor="#0061C1" 
BorderStyle="None" CaptionAlign="Bottom" EmptyDataText="No Records Found" 
Font-Names="Verdana" Font-Size="X-Small" ForeColor="#0061C1" 
Height="109px" OnRowDataBound="GridViewTTlist_RowDataBound" 
ShowFooter="True" ShowHeaderWhenEmpty="True" Width="99%" 
onselectedindexchanged="GridViewTTlist_SelectedIndexChanged" OnRowCreated="GridViewTTlist_RowCreated" >

Visible="False">

HorizontalAlign="Center" VerticalAlign="Middle" />




Font-Names="Verdana" Font-Size="X-Small" Height="24px" 
Text='<%# Eval("TaskName")%>' Width="70px">








Font-Names="Verdana" Font-Size="X-Small" 
Height="20px" Width="70px" Text='<%# Eval("DueDate","{0:dd/MM/yyyy}")%>' DataFormatString="{0:dd/MM/yyyy}">







Font-Names="Verdana" Font-Size="X-Small" Height="20px" Width="90px" Text='<%# Eval("Description")%>'>







Font-Names="Verdana" Font-Size="X-Small" Height="20px" Width="60px" Text='<%# Eval("AssignBy")%>'>







Font-Names="Verdana" Font-Size="X-Small" Height="20px" Width="90px" Text='<%# Eval("AssignTo")%>'>







Font-Names="Verdana" Font-Size="X-Small" Height="20px" Width="90px" Text='<%# Eval("Status")%>'>







Font-Names="Verdana" Font-Size="X-Small" 
Height="20px" Width="68px" Text='<%# Eval("PercentageComplete")%>'>







Font-Names="Verdana" Font-Size="X-Small" ForeColor="#0061C1" Height="24px" 
Text="View" Width="70px" NavigateUrl="Reports.aspx" DataNavigateUrlFields="TaskID" DataNavigateUrlFormatString="Reports.aspx?TaskID={0}" >View









snapshot of rid views. 1st is of my tasks .. i hav written query like the employee who logs in and who has been assigned task can only view the grid and 2nd snapsht is for d user who assigns d task and the 3 rd snap is of manager... alternatively wen each user logs in he/she wnt b able to view othr than their respective grid view.....