How to include quotation marks in a string

(This is a C# client/server app)

I have the following string variable

sTripUpdateSql = "Update trip set " + dc.ColumnName + " = " + sqlValue + " where TrpId = " + dr["TrpId"];

I need the sqlValue variable to include quotation marks around it.  For example, if sqlValue holds the value test, i want it to display "test" when the entire string is displayed.

So how do I hard code a set of quotes inside the string?

thanks