//Button click adds new P_Size to database
        protected void AddPSize_Click(object sender, EventArgs e)
        {
            //Conversion from String to Integer
            int sizeID = Convert.ToInt32(SizeID.Value);
            int psize  = Convert.ToInt32(PSize.Value);

            //Service function to add P_Size to database
            string P_Size = SR.Addpsize(sizeID, psize);

            //if adding is successful
            if (P_Size.Equals("added"))
            {
                //redirect to the home page
                Response.Redirect("Home.aspx");
            }
            //If P_Size was not added to database
            else if (P_Size.Equals("not added"))
            {
                //Display error message to admin
                error.Text    = "Product size type added to database. ";
                error.Visible = true;
            }
            //If P_Size already exists
            else if (P_Size.Equals("error"))
            {
                //Display error message to admin
                error.Text    = "MProduct sizeask type already exists. ";
                error.Visible = true;
            }
        }