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); } } }