private void addClientButton_Click(object sender, EventArgs e)
        {
            if (addClientTextBox.Text.Length == 0)
            {
                addClientLinkLabel_Click(null, null);
                return;
            }

            ulong workspaceID = timeEntry.WID;

            if (comboBoxWorkspace.Items.Count == 1)
            {
                workspaceID = ((Toggl.Model)comboBoxWorkspace.Items[0]).ID;
            }
            if (comboBoxWorkspace.Items.Count > 1)
            {
                workspaceID = selectedItemID(comboBoxWorkspace);
            }
            if (workspaceID == 0)
            {
                comboBoxWorkspace.Focus();
                return;
            }

            // Client with the same name already in list
            if (comboBoxClient.FindStringExact(addClientTextBox.Text) != -1)
            {
                comboBoxClient.Text = addClientTextBox.Text;
                addClientLinkLabel_Click(null, null);
                return;
            }

            bool clientCreated = Toggl.AddClient(workspaceID, addClientTextBox.Text);

            if (clientCreated)
            {
                comboBoxClient.Text = addClientTextBox.Text;
                newestClient        = addClientTextBox.Text;
            }
            addClientLinkLabel_Click(null, null);
        }