Conditional operator error with c# code on a DB update statement

I am receiving a CS1002: ; expected error with my c# code when writing a sql update statement that joins many lines of code together.  The problem line is the second one in my code example 'BD1'  Can someone assist with formatting of this line?  

NOTE: When I preview my question, I have a plus sign at the end of each line to string the lines of code together, but they are being removed.

"Last1 = '"+LName1.Text.Replace("'", "''") + "', " +
"BD1 = " string.IsNullOrEmpty(BD1.Text) == true ? "null, " + : "'"+BD1.Text.Replace("'", "''") + "', " +;
"First2 = '"+FName2.Text.Replace("'", "''") + "', " +

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