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Incorrect Syntax Near % Sql Parameter In C#.NET and SQL Server

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When writing sql statements in your business logic layer, you often want to append % which is a literal in your query. An example would be like this:
string query = "Select * from Patient where LastName like '" + "@family" + " %'";
However, this would give you an error, since the @family parameter is inside the tick marks that makes it a literal, but the % sign should be inside the tick marks. So, the correct sql syntax would be this way: 
string query = "Select * from Patient where LastName like (@family + '%')";
Source: VBForums Link

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