private void loadDataGridView() { dataGridView1.DataSource = null; dataGridView1.Columns.Clear(); dataGridView1.Refresh(); if (textBox1.Text == "" || textBox1.Text.Length <= 3) { dataGridView1 = Module.MydataGridView(dataGridView1); DataTable dt = TypeController.getListType(); if (dt.Rows.Count > 0) { dataGridView1.DataSource = TypeController.getListType(); dataGridView1.Columns[0].Visible = false; } } else { dataGridView1 = Module.MydataGridView(dataGridView1); dataGridView1.DataSource = TypeController.FindType(textBox1.Text); } DataGridViewButtonColumn testButtonColumn = new DataGridViewButtonColumn(); testButtonColumn.Name = "delete"; testButtonColumn.Text = "Xóa"; testButtonColumn.HeaderText = ""; testButtonColumn.UseColumnTextForButtonValue = true; int columnIndex = dataGridView1.Columns.Count; dataGridView1.Columns.Insert(columnIndex, testButtonColumn); }