The numbering system by which a particular state identifies a section of that state's version of the UCC will often differ from the numbering system used in the UCC, but will typically include some number keyed to the number of the same section in the UCC.  Here, Illinois uses the number 810 ILCS 5/2-102 to refer to section 2-102 of the UCC. 

     Note that the opinion does not explain why this federal court is applying the contract law of Illinois (both its statutory law, the Illinois version of the Uniform Commercial Code, and Illinois common law).  An opinion will typically not explain its choice of law if that choice is obvious or is not disputed by the parties.   The choice of law will likely not yet be obvious to you.  Under the rule of Erie R.R. Co. v. Tompkins, 304 U.S. 64 (1938), a decision of the United States Supreme Court, a federal district court such as the one hearing this case must apply to contract disputes the law of the state in which the district court sits.  Because this district court sits in Illinois, it must apply Illinois law, including Illinois rules on choice of law.  Illinois rules on choice of law would likely look to see whether the parties to this contract specified a choice of governing law or, if they did not, to the place the contract was formed or the place the contract was to be performed.   Application of such choice of law rules led to the conclusion that Illinois contract law should be applied to resolve this dispute, including the dispute about whether to apply the Illinois version of the Commercial Code or whether to apply Illinois common law.