How to clear the datagrid view data in winform?

See more:

WinForms

MySQL

Hi friends,
In window load, i create a datagrid view with checkbox and textbox column.

private System.Windows.Forms.DataGridViewTextBoxColumn colText = new DataGridViewTextBoxColumn();
private System.Windows.Forms.DataGridViewCheckBoxColumn colCheckBox = new DataGridViewCheckBoxColumn();

dataGridView1.Columns.AddRange(new DataGridViewColumn[] { colCheckBox, colText });
           colCheckBox.HeaderText = "Check";
           colText.HeaderText = "Amount";

string cnd = "select name from fees_master";
          MySqlDataAdapter da = new MySqlDataAdapter(cnd, connection);
          connection.Open();
          DataSet ds = new DataSet();
          da.Fill(ds, "course_master");
          dataGridView1.DataSource = ds.Tables["course_master"];
          connection.Close();

Its work correctly. but now i want to insert the mysql data in datagridview textbox column and check box check change. is any way is there?.

thanks in advance.