private void button3_Click object sender EventArgs Отмена cur_table co

 private void button3_Click(object sender, EventArgs e) // Отмена 
        {
                    cur_table = comboBox1.Text;
                    dataGridView1.ReadOnly = false;
                    dt = querry.getTable("select * from " + cur_table + ";");
                    dataGridView1.DataSource = dt;

                    if (dataGridView1.ColumnCount != 0)
                    {
                        
                        dataGridView1.Columns[0].ReadOnly = true;
                        for (int i = 0; i < dataGridView1.ColumnCount; i++)
                        {
                                DataGridViewColumn column = dataGridView1.Columns[i];
                                column.AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
                            
                        }
                    }
        }