ItemCommand kullanırken postback sorunu

<asp:Repeater ID="rptMyProjects" runat="server"> 
              <ItemTemplate> 
                  <asp:LinkButton ID="LinkButton1" runat="server" CommandArgument='<%# Eval("ProjectId") %>' CommandName="Project" Text='<%# Eval("ProjectName") %>' /> 
                  <br /> 
              </ItemTemplate> 
          </asp:Repeater>

<asp:DataList ID="DataList1" runat="server" OnItemCommand="DataList1_ItemCommand"> 
              <ItemTemplate> 
                  Görev Adı: <%# Eval("TaskName") %> 
              </ItemTemplate> 
          </asp:DataList>

protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e) 
      { 
          if (e.CommandName == "Project") 
          { 
              TaskTbl mytasks = new TaskTbl(); 
              List<TaskTbl> list = new List<TaskTbl>(); 
              int projectid = Convert.ToInt32(e.CommandArgument); 
              list = mytasks.MyUserTaskDataSource(projectid, 1); 
   
              DataList1.DataSource = list.ToList(); 
              DataList1.DataBind(); 
          } 
      }