Looking up a Type, and converting it to a generic parameter for a method

gistfile1.cs

public bool IsSurveillanceNoUnique(string surveillanceNo, SurveillanceType surveillanceType, SurveillanceContext surveillanceContext)
{
    var sType = SurveillanceTypeMap[surveillanceType];
    var methodInfo = _surveillances.GetType().GetMethod("IsSurveillanceNoUnique");
    methodInfo = methodInfo.MakeGenericMethod(sType);
    var unique = (bool) methodInfo.Invoke(_surveillances, new object[] {surveillanceNo, surveillanceContext});
    return unique;
}