How do you prepare Ethyl cyanide and Ethyl isocyanide from a common alkylhalide ?

Explanation

Ethyle chloride reacts with ethanolic potassium cyanide to form ethyle cyanide as the major product. However, when ethyle chloride reacts with ethanolic silver cycnide ethyle isocyanide will be the major product.
`{:(C_(2)H_(5)Cl overset("ethanolic KCN ")(to)C_(2)H_(5)CN+C_(2)H_(5)NC),(" Ethyl cyanide (major product) "" Ethyl isocyanide (minor product) "):}`
`{:(C_(2)H_(5)Cl overset("ethanolic.AgCN ")(to)C_(2)H_(5)CN+C_(2)H_(5)CN),(" Ethyl isocyanide (major product) "" Ethyl cyanide (minor product "):}`