lazycoder-razor.cshtml

@TextSearchField("test", "test", true)

@helper TextSearchField(string name, string label, bool autocomplete)
{
    <div class="searchCrit">
        <label for="@name">@label</label>
                    
        @if(autocomplete) {                   
            <input type="text" name="@name" class="autocompleteField" />
        }
        else {                   
            <input type="text" name="@name" />
        }

    </div> 
}

output.html

    <div class="searchCrit">

        <label for="test">test</label>

                    

            <input type="text" name="test" class="autocompleteField" />



    </div> 

If you remove the "@" in front of the "if" or remove the closing characters on the both cause it to fail.