public static (bool, {returnTypeFullName}) Update{entityTypeName}(
            this {contextFullName} dbContext, 
            {updateTypeFullName} {updateVarName},
            {keyTypeFullName} {keyVarName})
        {
            var {existingEntityVarName} = dbContext.{propertyName}.FirstOrDefault(x => x.{keyPropertyName} == {keyVarName});
            if ({existingEntityVarName} == null) return (false, null);
            {existingEntityVarName}.Update({updateVarName});
            dbContext.{propertyName}.Update({existingEntityVarName});
            var result = dbContext.SaveChanges() >= 0;
            return (result, new {returnTypeFullName}({existingEntityVarName}));

        }