How to Select default value in dropdown in mvc base on condition

Question

<select type="text" name="ErrorId" id="[email protected]"

onchange="if(ValidateCurrentRowError(this)) calculateQAScore('@Model.ICSDocNumber');">

<option>-select-</option>

@{

if( ViewBag.ErrorTypeMaster!=null){

foreach(var el in ViewBag.ErrorTypeMaster){

<option value="@el.Id" selected="@(el.Id==entity.ErrorId)"

data-error-category="@el.ErrorCategory"> @el.ErrorType </option>

}

}

}

</select>

 

I have a dropdown,in ViewBag.ErrorTypeMaster I have table in this format

Id ErrorId ErrorCategory ErrorType

1  10        Critical             A

2  11        Critical             B

3  12        Critical            C

4  13        Critical             D

 

When a page loads I am getting a value in one varriable that is departmentId,if departmentId is 7 I want by default D Errortype to be selected in drodpown. Kindly guide me on this. What changes I must do while binding dropdown