Del. R. Civ. P. Super. Ct. 51
At the close of the evidence or at such earlier time as the Court reasonably directs, any party may file written requests that the Court instruct the jury on the law as set forth in the requests. The Court shall inform counsel of its proposed action upon the requests prior to their arguments to the jury. The Court may instruct the jury before or after the arguments are completed and such other times, including prior to the introduction of evidence, as the Court may desire. No party may assign as error the giving or the failure to give an instruction unless a party objects thereto before or at the time set by the Court immediately after the jury retires to consider its verdict, stating distinctly the matter to which the party objects and the grounds of the party's objection. Opportunity shall be given to make the objection out of the hearing of the jury.
Del. R. Civ. P. Super. Ct. 51