Checkbox not working in mvc3

You have to do it as follows:

<input type="checkbox" onclick = "InActiveUser('@item.UserId')" 
 id = "@item.UserId" checked="@item.IsActive" />

As Patryk said - you need to change the way the checked attribute is added. Something like this:

<input type="checkbox" onclick = "InActiveUser('@item.UserId')" id = "@item.UserId"   @(item.IsActive ? "checked" : "") />

Try that.

Try something like this:

 @{
  if (ViewBag.IsActive)
  {
    <input type="checkbox" id="@item.UserId" checked onclick = "InActiveUser('@item.UserId')"/>
  }
  else
  {
    <input type="checkbox" id="@item.UserId" onclick = "InActiveUser('@item.UserId')"/>
  }
}

Approach - 1

@if(item.IsActive)
{
    <input type="checkbox" onclick = "InActiveUser('@item.UserId')" 
       id = "@item.UserId" checked="checked" />
}
else
{
    <input type="checkbox" onclick = "InActiveUser('@item.UserId')" 
         id = "@item.UserId"/> 
}

Approach - 2

You can use below code.

$("input[type='checkbox']").prop('checked', true);    // Checked
$("input[type='checkbox']").prop('checked', false);   // Un-Checked

If you pay attention to the above code, prop function is used to set the attribute value. You can use JQuery - 1.6 version. Now based upon your condition, you can write Razor code in the JavaScript section like below..

<script type="text/javascript">
    $(document).ready(function () {                   //Some Razor code in JQuery
        var status = "@status" == "True" ? true : false;
        $("input[type='checkbox']").prop('checked', status);
    });
</script>

Server side sample code in View.cshtml

@{
    var status = false;
}

Approach - 3

JQuery

<script type="text/javascript">
    $(document).ready(function () {                   //Some Razor code in JQuery
        var status = "@status" == "True" ? true : false;
        if (!status)
            $("input[type='checkbox']").removeAttr('checked');
        else
            $("input[type='checkbox']").attr('checked', true);

    });
</script>

Server side code in cshtml

@{
    var status = true;
}

If you pay attention to the above JQuery code, I am removing the checked attribute using the removeAttr in case status value is false and setting it to true using the attr function when status is true.