jquery document ready function firing twice

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MVC

jQuery

My problem is $(document).ready(function(){}) is firing twice. I have already checked whether the js file is linked twice in any page or not.but it is not the issue. I have already tried with a variable and set it's value initially to 'false' and then set it to 'true' inside $(document).ready. Please check from the code bellow.

var _DONE = false;

$(document).ready(function () {    
    if (_DONE == true) {           
        return;
    }  
    _DONE = true;
    InitUserAllocationRoleDD();
    var grid = $("#CWUsersAllocationGrid").data("kendoGrid");
    grid.bind("dataBound", function (e) { setGeneralGridHeight('CWUsersAllocationGrid') });
});

This piece of code is also not working.

Actual Code:

 $(document).ready(function () {
    InitUserAllocationRoleDD();
    var grid = $("#CWUsersAllocationGrid").data("kendoGrid");
    grid.bind("dataBound", function (e) { setGeneralGridHeight('CWUsersAllocationGrid') });
});

function InitUserAllocationRoleDD() {
    GetDomainUsers();
    $('#cwallocationrole').unbind('change');
    $('#cwallocationrole').on('change', function () {
        if ($(this).find('option:selected').text() == '--Select--') {
            DomainNameSelector.val("");
            SequenceNumberSelector.val("");
            UserDefinedTextSelector.val("");
            return false;
        }
        selectedvalue = $(this).val();
        SelectedText = $(this).find('option:selected').text();
        SplitValue = selectedvalue.split("_");
        SplitText = SelectedText.split(":");
        $('#DomainName').val(SplitValue[1] + "_");
        $('#SequenceNumber').val("_" + SplitValue[2]);
        $('#UserDefinedText').val('');
    });
}