C# - Access array without null exception

Question

I have to set these variables through with the QueryString array:

UtmSource = HttpContext.Current.Request.QueryString["utm_source"];
UtmMedium = HttpContext.Current.Request.QueryString["utm_medium"];
UtmCreative = HttpContext.Current.Request.QueryString["utm_creative"];
UtmCampaign = HttpContext.Current.Request.QueryString["utm_campaign"];
UtmTerm = HttpContext.Current.Request.QueryString["utm_term"];
UtmContent = HttpContext.Current.Request.QueryString["utm_content"];
Tag1 = HttpContext.Current.Request.QueryString["utm_source"];
Tag2 = HttpContext.Current.Request.QueryString["m"];

Some keys in the query string might throw null exception.

I don't want to wrap each var in try catch and I don't want to wrap all with try catch because if the first one fails, the entire will be null/avoided.

How can I safely access these variables?

Answer 1

I would use the null-coalescing operator to make it nice and simple

UtmSource = Request.QueryString["utm_source"] ?? "DefaultValue"

You can read more about the operator at MSDN.