ASP.NET

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@model StudentManagement1.TeacherCourseStudent
@{
    ViewBag.Title = "Attendance";
}
 

<tr>
    
    
    <td>
       @Model.Student_Id
    </td>
 
    <td>
        @Model.Student.Name
    </td>
 
    <td>
        @Model.Student.Sur_Name
    </td>
 
    <td>
       @Model.Student.Semester.Semester_Name
    </td>
 
    <td>
    @Html.RadioButton(@Model.Student_Id.ToString(), "present", true)
    </td>
 
    <td>
    @Html.RadioButton(@Model.Student_Id.ToString(), "absent")
    </td>
 
    <td>
    @Html.RadioButton(@Model.Student_Id.ToString(), "leave")
    </td>
 

@model IEnumerable<StudentManagement1.TeacherCourseStudent>
@{
    ViewBag.Title = "MarkAttendance";
    Layout = "~/Views/Shared/_TeacherLayout.cshtml";
}
 
@using (Html.BeginForm("MarkAttendance", "Attendance", FormMethod.Post))
{
   
 
<table>
    <tr>
        <th>
           Student Id
        </th>
        <th>
            Name
        </th>
        <th>
           Sur Name
        </th>
        <th>
           Semester
        </th>
        <th>
            Present
        </th>
        <th>
            Absent
        </th>
        <th>
            Leave
        </th>
 
        
</tbody>
@Html.EditorForModel()
</table>
        <br /> <br />
    <input type="submit" value="Save attendance" />
}
 

[HttpPost]
        public ActionResult MarkAttendance(IEnumerable<string> Student_Id)
        {
            return view();
}

 <div onblur="alert('dosent work this Event!!!!!')">

 '---Dropdownlist control
 <asp:Panel runat="server" ID="pnlLoc" Font-Names="Calibri" BorderStyle="Solid" BorderWidth="1" Style="margin: 0 auto; width:300px;">
             <table>
                 <tr>
                     <td>
                         <asp:Label runat="server" ID="lblLoc" Text="Location: " />
                     </td>
                     <td>
                         <asp:DropDownList runat="server" ID="ddLoc" DataSourceID="dslocator6" AutoPostBack="True">
 
                         </asp:DropDownList>
                     </td>
                 </tr>
             </table>
          </asp:Panel

 --Report viewer control
   <rsweb:ReportViewer ID="ReportViewer1" runat="server" AsyncRendering="true" SizeToReportContent="true" Font-Names="Arial" 
        Height="675px" Width="750px">
        <LocalReport EnableExternalImages="true" ReportPath=""> 
        </LocalReport> 
    </rsweb:ReportViewer></center>
     <asp:ObjectDataSource ID="LOC" runat="server" SelectMethod="GetData" TypeName="ManageReportsTableAdapters.searchBylocationsTableAdapter">
      <SelectParameters>
        <asp:ControlParameter ControlID="ddLoc" Name="Location" DefaultValue=" " />
      </SelectParameters>
     </asp:ObjectDataSource> 

           --This code populates the ddLoc dropdownlist
               Protected Sub btnLoc_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnLoc.Click
               ReportViewer1.LocalReport.ReportPath = ""
               pnlLoc.Visible = True
               which.Value = "P"
               dslocator6.SelectCommand = "SELECT location FROM Locations ORDER BY [location]"
               ddLoc.DataTextField = "location"
               ddLoc.DataValueField = "location"
              End Sub

          Sub Run_Report(ByVal sel As String)
            ReportViewer1.Reset()
            ReportViewer1.LocalReport.DataSources.Clear()
            Dim params(0) As ReportParameter
 
            ReportViewer1.LocalReport.DataSources.Add(New ReportDataSource("locs", LOC.ID))
            ReportViewer1.LocalReport.ReportPath = "locations.rdlc"
            ReportViewer1.LocalReport.Refresh()
            params(0) = New ReportParameter("loc", sel, False)
            ReportViewer1.LocalReport.SetParameters(params) '<-- error points to this line
            
           End Sub