ASP.NET

$(function () {
    // Proxy created on the fly
    var chat = $.connection.chat;

    // Declare a function on the chat hub so the server can invoke it
    chat.addMessage = function (message) {
        $('#messages').append('<li>' + message + '');
    };

    $("#broadcast").click(function () {
        // Call the chat method on the server
        chat.send($('#msg').val());
    });

    // Start the connection
    $.connection.hub.start();
});

public class Chat : Hub
{
    public void Send(string message)
    {
        // Call the addMessage method on all clients
        Clients.addMessage(message);
    }
}

Imports Microsoft.AspNet.Identity
Imports Microsoft.AspNet.Identity.EntityFramework
Imports Microsoft.AspNet.Identity.Owin
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports Microsoft.Owin.Security

Partial Public Class Account_Login
    Inherits Page
    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        RegisterHyperLink.NavigateUrl = "Register"
        OpenAuthLogin.ReturnUrl = Request.QueryString("ReturnUrl")
        Dim returnUrl = HttpUtility.UrlEncode(Request.QueryString("ReturnUrl"))
        If Not [String].IsNullOrEmpty(returnUrl) Then
            RegisterHyperLink.NavigateUrl += "?ReturnUrl=" & returnUrl
        End If
    End Sub

     Protected Sub LogIn(sender As Object, e As EventArgs) Handles btnLogin.Click

    If IsValid Then ' Validate the user password             

        Dim manager = New UserManager()

        Dim user As ApplicationUser = manager.Find(username.Text, password.Text)

        Try

            If user IsNot Nothing Then

                IdentityHelper.SignIn(manager, user, RememberMe.Checked)

                IdentityHelper.RedirectToReturnUrl(Request.QueryString("ReturnUrl"), Response)

            End If

        Catch ex As Exception

            FailureText.Text = ex.Message

            ErrorMessage.Visible = True

        End Try

    End If

End Sub

End Class

@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