Question

I am adding data to my database, but would like to retrieve the UnitID that is Auto generated.

using (SqlConnection connect = new SqlConnection(connections)) 
{ 
SqlCommand command = new SqlCommand("ContactInfo_Add", connect); 
command.Parameters.Add(new SqlParameter("name", name)); 
command.Parameters.Add(new SqlParameter("address", address)); 
command.Parameters.Add(new SqlParameter("Product", name)); 
command.Parameters.Add(new SqlParameter("Quantity", address)); 
command.Parameters.Add(new SqlParameter("DueDate", city)); 
connect.Open(); 
command.ExecuteNonQuery(); 
} 

…

ALTER PROCEDURE [dbo].[Contact_Add] 
@name varchar(40), 
@address varchar(60), 
@Product varchar(40), 
@Quantity varchar(5), 
@DueDate datetime 
AS  
BEGIN 
 SET NOCOUNT ON; 

 INSERT INTO DBO.PERSON 
 (Name, Address) VALUES (@name, @address) 
 INSERT INTO DBO.PRODUCT_DATA 
 (PersonID, Product, Quantity, DueDate) VALUES (@Product, @Quantity, @DueDate) 
END 

Answer 1

Add an output parameter to your procedure:

@new_id int output

and after the insert statement, assign it value:

set @new_id = scope_identity()

The add it to your calling code:

command.Parameters.Add("@new_id", SqlDbType.Int).Direction = ParameterDirection.Output;

and retrieve the value:

int newId = Convert.ToInt32(command.Parameters["@new_id"].Value);