如何在datagridview中的任何选定列或行中添加数据

Question

我的任务是创建一个计划表单，我必须在每个指定的日期在一列或数据中添加多个文本。

我遇到的问题是它只能为多列添加一行。

我需要做的是为每列添加多行数据。

以下是代码的一部分：

private void button1_Click_1(object sender, EventArgs e)
{
        //dgv1.Rows.Add(1);
        if (comboBox1.Text == "Monday")
        {

            DataGridViewRow row = dgv1.Rows[rowcount];
            row.Height = 60;

            grpclassname = textBox1.Text;
            txtinst = cmbInstructor.Text;
            txtdesc = textBox3.Text;
            txtFull = grpclassname + "\n" + txtinst + "\n" + txtdesc;

            dgv1.Rows[rowcount].Cells[0].Value = 
                   tp1.Value.ToShortTimeString() + " - " + tp2.Value.ToShortTimeString();
            dgv1.Rows[rowcount].Cells[1].Value = txtFull;

            //rowcount++;
            //dgv1.Rows.Add(1);
        }

        else if (comboBox1.Text == "Tuesday")
        {
            DataGridViewRow row = dgv1.Rows[rowcount];
            row.Height = 60;

            grpclassname = textBox1.Text;
            txtinst = cmbInstructor.Text;
            txtdesc = textBox3.Text;
            txtFull = grpclassname + "\n" + txtinst + "\n" + txtdesc;

            dgv1.Rows[rowcount].Cells[0].Value = 
                   tp1.Value.ToShortTimeString() + " - " + tp2.Value.ToShortTimeString();
            dgv1.Rows[rowcount].Cells[2].Value = txtFull;

            //rowcount++;
        }

        else if (comboBox1.Text == "Wednesday")
        {
            DataGridViewRow row = dgv1.Rows[rowcount];
            row.Height = 60;

            grpclassname = textBox1.Text;
            txtinst = cmbInstructor.Text;
            txtdesc = textBox3.Text;
            txtFull = grpclassname + "\n" + txtinst + "\n" + txtdesc;

            dgv1.Rows[rowcount].Cells[0].Value = 
                   tp1.Value.ToShortTimeString() + " - " + tp2.Value.ToShortTimeString();
            dgv1.Rows[rowcount].Cells[3].Value = txtFull;

            //rowcount++;
        }