Uncaught reference error:False is not defined

I have the following call to javascript: ``` protected override void OnPreRender(EventArgs e) { base.OnPreRender(e); this._BtAdd.Attributes.Add("onclick", "GXDualListBox_MoveDualList(" + sourceListId + ", " + destListId + ", " + selectedValuesId + ", false, true, "+ this._SortByDescription +");"); this._BtRemove.Attributes.Add("onclick", "GXDualListBox_MoveDualList(" + destListId + ", " + sourceListId + ", " + selectedValuesId + ", false, false, " + this._SortByDescription + ");"); if (!this._PostBackOnAll) { this._BtAddAll.Attributes.Add("onclick", "GXDualListBox_MoveDualList(" + sourceListId + ", " + destListId + ", " + selectedValuesId + ", true, true, " + this._SortByDescription + " );"); this._BtRemoveAll.Attributes.Add("onclick", "GXDualListBox_MoveDualList(" + destListId + ", " + sourceListId + ", " + selectedValuesId + ", true, false, " + this._SortByDescription + " );"); } // Check if user can double-click on listbox item to move it if (this._AllowDblClick) { this._LstSource.Attributes.Add("ondblclick", "GXDualListBox_MoveDualList(" + sourceListId + ", " + destListId + ", " + selectedValuesId + ", false, true, " + this._SortByDescription + " );"); this._LstDestination.Attributes.Add("ondblclick", "GXDualListBox_MoveDualList(" + destListId + ", " + sourceListId + ", " + selectedValuesId + ", false, false, " + this._SortByDescription + " );"); } } ``` this._SortByDescription is bool which would be false in this case. The javascript is as follows: ``` function GXDualListBox_MoveDualList(srcList, destList, selectedValues, moveAll, isAdd,sortByDescription) { if ((srcList.selectedIndex == -1) && (moveAll == false)) { return; } newDestList = new Array(destList.options.length); for (var len = 0; len < destList.options.length; len++) { if (destList.options[len] != null) { newDestList[len] = new Option(destList.options[len].text, destList.options[len].value, destList.options[len].defaultSelected, destList.options[len].selected); } } for (var i = 0; i < srcList.options.length; i++) { if (srcList.options[i] != null && (srcList.options[i].selected == true || moveAll)) { newDestList[len] = new Option(srcList.options[i].text, srcList.options[i].value, srcList.options[i].defaultSelected, srcList.options[i].selected); len++; } } if (sortByDescription) { newDestList.sort(GXDualListManager_CompareOptionValues); newDestList.sort(GXDualListManager_CompareOptionText); } for (var j = 0; j < newDestList.length; j++) { if (newDestList[j] != null) { destList.options[j] = newDestList[j]; } } } if (isAdd) buildSelectedList(destList, selectedValues); else buildSelectedList(srcList, selectedValues); } ``` When I hard code this._SortByDescription as 'false' in the javascript call, it works. But replacing 'false' with this._SortByDescription results in error. Also I observed while debugging that the javascript receives the value of this._SortByDescription as 'False' instead of 'false'. Not sure if this matters. I am working on javascript for the first time. Please help.