private void btnSearch_Click(object sender, EventArgs e)
        {
            string filter = txtSearch.Text.Trim();

            if (!string.IsNullOrEmpty(filter))
            {
                ProjectBusiness projectBuss = new ProjectBusiness(_user);
                dgvProject.DataSource = null;
                try
                {
                    dgvProject.DataSource = projectBuss.GetAllFiltered(filter);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }