How to set default checked radio button in nopcommerce 4.3

I want to check bydefault one radiobutton from three option in nopcommerce 4.3

Here is my code,

<div class="col-md-6">
    <div class="raw">
        <div class="col-md-2">
            <div class="radio">
                <label>
                    @Html.RadioButton("LabourChargeUnit", "false", (Model.LabourChargeUnit == "PCS"), new { id = "LabourChargeUnit_PCS"})
                    @T("Admin.Catalog.Product.Fields.LabourChargeUnit.PCS")
                </label>
            </div>
        </div>
        <div class="col-md-2">
            <div class="radio">
                <label>
                    @Html.RadioButton("LabourChargeUnit", "false", (Model.LabourChargeUnit == "PER"), new { id = "LabourChargeUnit_PER" })
                    @T("Admin.Catalog.Product.Fields.LabourChargeUnit.PER")
                </label>
            </div>
        </div>
        <div class="col-md-2">
            <div class="radio">
                <label>
                    @Html.RadioButton("LabourChargeUnit", "true", (Model.LabourChargeUnit == "GM"), new { id = "LabourChargeUnit_GM" })
                    @T("Admin.Catalog.Product.Fields.LabourChargeUnit.GM")
                </label>
            </div>
        </div>
    </div>
</div>

Now, I have tried many things like new{@checked = "checked"}, true/false, 0/1 but didnt work.

Any Update...???

your method signature looks correct, is it safe to assume that Model.LabourChargeUnit is a string?  maybe try String.Equals instead, and make sure you don't need a .ToUpper() or .ToLower() before comparing?

sksoni wrote:

Why is your second parameter  "false"?

Definition for method is
RadioButton(string name, object value, bool isChecked, object htmlAttributes)

Shouldn't it be the value?  (eg. "PCS")