private void button2_Click(object sender, EventArgs e)
        {
            if (textCollectionName.Text == "" || textCollectionName.Text == null)
            {
                MessageBox.Show("Collection name is required.", "Error Creating Collection");
                return;
            }
            if (!Regex.IsMatch(textCollectionName.Text, @"^[\p{L}]+$"))
            {
                MessageBox.Show("Collection name can only have letters.", "Error Creating Collection");
                return;
            }


            IEnumerable <CustomCollection> allCollections = dbc.getCollections();

            String newCollectionName = dbc.RemoveTurkishCharacters(textCollectionName.Text);

            foreach (CustomCollection collection in allCollections)
            {
                if (collection.name == newCollectionName)
                {
                    MessageBox.Show("Collection already exists.", "Error Creating Collection");
                    return;
                }
            }

            List <Attribute> attributes = new List <Attribute>();

            if (listBox1.Items.Count == 0)
            {
                MessageBox.Show("At least one field is required.", "Error Creating Collection");
                return;
            }
            foreach (Field f in listBox1.Items)
            {
                var attr = new Attribute
                {
                    name = f.name,
                    type = f.type,
                };

                attributes.Add(attr);
            }

            var customCollection = new CustomCollection
            {
                name       = dbc.RemoveTurkishCharacters(textCollectionName.Text),
                aliase     = textCollectionName.Text,
                attributes = attributes,
            };

            dbc.createCollection(newCollectionName, attributes);

            mainForm.updateCollectionList();
            mainForm.updateItemList(customCollection);
            mainForm.setSelectedCollection(customCollection);
            this.Close();
        }
        public void updateCollectionList()
        {
            flowLayoutPanel1.Controls.Clear();

            collectionList = dbc.getCollections();

            foreach (CustomCollection collection in collectionList)
            {
                Button button = new Button();
                button.Width  = 170;
                button.Height = 35;
                button.Anchor = AnchorStyles.None;

                button.FlatStyle = FlatStyle.Flat;
                button.BackColor = Color.White;
                button.Font      = new Font("Microsoft YaHei", 8.25f);
                button.Text      = collection.aliase;
                button.Click    += (s, e) =>
                {
                    updateItemList(collection);
                };
                flowLayoutPanel1.Controls.Add(button);
            }
        }