Visual Studio snippets I use. See this blog post for more detail: http://blog.robseder.com/2014/10/15/common-visual-studio-snippets-i-use/

argNull.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
      <Title>argNull</Title>
      <Author>RobSeder@outlook.com</Author>
      <Description>Snippet to check an argument for null, and throw an appropriate exception.</Description>
      <HelpUrl>http://blog.robseder.com/2014/10/15/common-visual-studio-snippets-i-use/</HelpUrl>
      <Shortcut>argNull</Shortcut>
    </Header>
    <Snippet>
      <Declarations>
        <Literal Editable="true">
          <ID>ArgName</ID>
          <ToolTip>ArgName</ToolTip>
          <Default>ArgName</Default>
          <Function>
          </Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Delimiter="$"><![CDATA[if ($ArgName$ == null)
                throw new ArgumentNullException("$ArgName$");]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

argString.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
      <Title>argString</Title>
      <Author>RobSeder@outlook.com</Author>
      <Description>Snippet to check a string argument for null or whitespace, and throw an appropriate exception.</Description>
      <HelpUrl>http://blog.robseder.com/2014/10/15/common-visual-studio-snippets-i-use/</HelpUrl>
      <Shortcut>argString</Shortcut>
    </Header>
    <Snippet>
      <Declarations>
        <Literal Editable="true">
          <ID>ArgName</ID>
          <ToolTip>ArgName</ToolTip>
          <Default>ArgName</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>", "</ID>
          <ToolTip>", "</ToolTip>
          <Default>", "</Default>
          <Function>
          </Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Delimiter="$"><![CDATA[if (String.IsNullOrWhiteSpace($ArgName$))
    throw new ArgumentException("Argument \"$ArgName$\" cannot be null or empty.", "$ArgName$");]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

exceptionProper.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
      <Title>exceptionProper</Title>
      <Author>RobSeder@outlook.com</Author>
      <Description>Snippet to create a proper exception class; implementing all standard constructors, and includes XML code comments.</Description>
      <HelpUrl>http://blog.robseder.com/2014/10/15/common-visual-studio-snippets-i-use/</HelpUrl>
      <Shortcut>exceptionProper</Shortcut>
    </Header>
    <Snippet>
      <Declarations>
        <Literal Editable="true">
          <ID>NameSpace</ID>
          <ToolTip>NameSpace</ToolTip>
          <Default>NameSpace</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>Name</ID>
          <ToolTip>Name</ToolTip>
          <Default>Name</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>Parent</ID>
          <ToolTip>Parent</ToolTip>
          <Default>Parent</Default>
          <Function>
          </Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Delimiter="$"><![CDATA[/// <summary>
/// Exception class for the $NameSpace$.$Name$ namespace.
/// </summary>
public class $Name$Exception : $Parent$Exception
{
    /// <summary>
    /// Creates a new instance of this type.
    /// </summary>
    public $Name$Exception()
    {
    }

    /// <summary>
    /// Creates a new instance of this type.
    /// </summary>
    /// <param name="message">The message to include with this exception.</param>
    public $Name$Exception(string message) : base(message)
    {
    }

    /// <summary>
    /// Creates a new instance of this type.
    /// </summary>
    /// <param name="message">The message to include with this exception.</param>
    /// <param name="inner"></param>
    public $Name$Exception(string message, Exception inner) : base(message, inner)
    {
    }
}]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

propProper.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>
      </SnippetTypes>
      <Title>propProper</Title>
      <Author>RobSeder@outlook.com</Author>
      <Description>Snippet to create a full property declaration with a backing field, in a collapsible format - with XML code comments.</Description>
      <HelpUrl>http://blog.robseder.com/2014/10/15/common-visual-studio-snippets-i-use/</HelpUrl>
      <Shortcut>propProper</Shortcut>
    </Header>
    <Snippet>
      <Declarations>
        <Literal Editable="true">
          <ID>DescriptionOfProperty</ID>
          <ToolTip>DescriptionOfProperty</ToolTip>
          <Default>DescriptionOfProperty</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>DataType</ID>
          <ToolTip>DataType</ToolTip>
          <Default>DataType</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>PropertyName</ID>
          <ToolTip>PropertyName</ToolTip>
          <Default>PropertyName</Default>
          <Function>
          </Function>
        </Literal>
        <Literal Editable="true">
          <ID>fieldName</ID>
          <ToolTip>fieldName</ToolTip>
          <Default>fieldName</Default>
          <Function>
          </Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Delimiter="$"><![CDATA[/// <summary>
        /// Gets or sets $DescriptionOfProperty$.
        /// </summary>
        public $DataType$ $PropertyName$
        {
            get { return _$fieldName$; }
            set { _$fieldName$ = value; }
        } private $DataType$ _$fieldName$ = default($DataType$);]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>