panel1.Visible = true;
dataGridView2.Columns[0].Visible =false;dataGridView2.Columns[0].Visible = false;dataGridView2.Columns[0].Visible = false;dataGridView2.Columns[0].Visible = false;dataGridView2.Columns[0].Visible = false;dataGridView2.Columns[0].Visible = false;dataGridView2.Columns[0].Visible = false;
是正确的
则
panel1.Visible = false;
……
dataGridView2.Columns[0].Visible = false;
panel1.Visible = true;
是错误的