Inserting elements of one List To Another - asp.net

Question

I am new to programming. I am retrieving a column Price from my database and saving it into a list. I want to perform some multiplication with that data and want to store the result after multiplication into another list. Here is the code i wrote to fetch data and store it into a list.
SqlDataAdapter da = new SqlDataAdapter("Select Price from FoodPackages",con);
DataSet dataset = new DataSet();
da.Fill(dataset, "FoodPackages");
List<int> package_price = new List<int>();
foreach(DataRow row in dataset.Tables["FoodPackages"].Rows)
{
package_price.Add(Convert.ToInt32(row["Price"]));
}
for( int i = 0; i<package_price.Count; i++)
{
int food = guest * package_price[i]; // Food = The total food cost
}
The line in which i am multiplying guest with each element of list. Here i have an integer variable but instead of this i want a list. Kindly help me do this.
Thanks in advance

Answer 1

If I understand you correctly like this:
SqlDataAdapter da = new SqlDataAdapter("Select Price from FoodPackages",con);
DataSet dataset = new DataSet();
da.Fill(dataset, "FoodPackages");
List<int> package_price = new List<int>();
foreach(DataRow row in dataset.Tables["FoodPackages"].Rows)
{
package_price.Add(Convert.ToInt32(row["Price"]));
}
// Initialize a new list
List<int> myList = new List<int>();
for( int i = 0; i<package_price.Count; i++)
{
int food = guest * package_price[i]; // Food = The total food cost
// Add element into the list
myList.Add(food);
}
ADD: If a "guest" variable is not type of int, then you have to create List of decimal:
List<decimal> myList = new List<decimal>();
for( int i = 0; i<package_price.Count; i++)
{
//int food = guest * 20; // this line is not necessary
// You can calculate and add element into the list at once
myList.Add(guest * 20);
}