[Snippet][C#] Throw ArgumentNullException is parameter if null.

throwifnull.snippet

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  <CodeSnippet Format="1.0.0">
    <Header>
      <Title>throwifnull</Title>
      <Shortcut>tin</Shortcut>
      <Description>Code snippet for an automatically implemented throw if null.</Description>
      <Author>Microsoft Corporation</Author>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
    </Header>
    <Snippet>
      <Declarations>
        <Literal>
          <ID>param</ID>
          <ToolTip>Property name</ToolTip>
          <Default>param</Default>
        </Literal>
      </Declarations>
      <Code Language="csharp">
        <![CDATA[$param$ ?? throw new ArgumentNullException(nameof($param$));$end$]]>
      </Code>
      <Imports>
        <Import>
          <Namespace>System</Namespace>
        </Import>
      </Imports>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>