Framework for SQL string Concatenation?

I am curious... is there a framework that has tackled all possible SQL concatenations making it very simple for the developer? For example, Can I make a form with three combo boxes. Can I then all any field type in boxes one and two that will then concatenate the two fields, regardless of type, into a third combo box (will likely be ntext, but I've written code to detect the type of boxes 1 & 2 and adjust accordingly). So If I put a Date column in comboBox1 and VARCHAR(50) column in comboBox2, and I choose a VARCHAR(2000) for comboBox3, I wonder is there a framework that does the cast/convert and all of the implementation details for me? Perhaps LINQ does this?