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Selecting Contacts from the List

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The SelectButton control on the contact list form processes all of the contacts selected by the user. A collection of ListViewItem objects is obtained from the SelectedItems property of the ListView object. The collection is iterated over and a string is appended with the SigninName of the selected contact and delimited with a comma. The generic dictionary<int, string> that was created and filled when the contact list was loaded is used here to obtain the SigninNames of the selected contacts.

        private void SelectButton_Click(object sender, EventArgs e)
        {
            /*
             * When this form is opened and the SelectMode property is
             * set to true, this selectButton is displayed so that the user
             * can select multiple contacts. The selected contacts are returned
             * with the SignInName property which will contain a comma-separated list
             * of contact sign-in names.
             * 
             * This code iterates on the collection of selected listview items and looks
             * up the corresponding signin name from the dictionary<int,string> object listDict
             * Each signin name is appended to a string. Until the count of 
             * selected contacts processed by the foreach loop reaches the total number of contacts
             * processed, a comma is appended to the string.
             */
            StringBuilder sb = new StringBuilder();
            int currentSelectedContact = 1;
            foreach (ListViewItem selectedContactItem in contactListView.SelectedItems)
            {
                if (contactListView.SelectedItems.Count == 1)
                {
                    //append signin name of contact
                    sb.Append(listDict[selectedContactItem.Index+1]);
                }
                else
                {
                    //append signin name of contact
                    sb.Append(listDict[selectedContactItem.Index+1]);

                    //append a comma if this contact is not the last contact selected
                    if (currentSelectedContact < contactListView.SelectedItems.Count)
                        sb.Append(", ");
                    currentSelectedContact++;
                }
            }
            // fill property with string built by foreach loop
            signInName = sb.ToString();
            this.Close();
        }
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