Delete rows in Gridview

hi, I am having a problem with deleting gridview rows. I am populating my gridview by selecting value in a dropdownlist then by clicking the add button, value will be added in my gridview, here is my code:

in my aspx:

CssClass="mGrid" EmptyDataText = "There are no records to display">

in my code behind:

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

DataSet ds = new DataSet();

DataTable dt = new DataTable();

DataColumn dc = new DataColumn("Id");

DataColumn dc1 = new DataColumn("Name");

//DataColumn dc2 = new DataColumn("Id");

dt.Columns.Add(dc);

dt.Columns.Add(dc1);

// dt.Columns.Add(dc2);

ds.Tables.Add(dt);

Session["data"] = ds;

GridView1.DataBind();

}

protected void btnSave_Click(object sender, EventArgs e)

{

SqlConnection con = new SqlConnection("Data Source=GATE-PC\\SQLEXPRESS;Initial Catalog=dbProfile;Integrated Security=True");

con.Open();

foreach (GridViewRow row in GridView1.Rows)

{

SqlCommand cmdd = new SqlCommand("Insert into Profile (Id, profile_Id)VALUES(@id, @pid)", con);

cmdd.CommandType = System.Data.CommandType.Text;

cmdd.Parameters.AddWithValue("@id", row.Cells[1].Text);

cmdd.Parameters.AddWithValue("@pid", txtbid.Text);

cmdd.ExecuteNonQuery();

}

protected void btnAdd_Click(object sender, EventArgs e)

{

DataSet ds = (DataSet)Session["data"];

DataRow dr = ds.Tables[0].NewRow();

dr[0] = DropDownList1.Text.Trim();

dr[1] = DropDownList1.SelectedItem;

//dr[2] = txtId.Text.Trim();

ds.Tables[0].Rows.Add(dr);

GridView1.DataSource = ds;

GridView1.DataBind();

}

Now, I am trying to remove checked rows on my gridview with this code:

protected void btnRemove_Click(object sender, EventArgs e)

{

ArrayList del = new ArrayList();

foreach (GridViewRow row in GridView1.Rows)

{

if (row.RowType == DataControlRowType.DataRow)

{

CheckBox chkDelete = (CheckBox)row.Cells[0].FindControl("CheckBox1");

if (chkDelete != null)

{

if (chkDelete.Checked)

{

string id = row.Cells[1].Text;

del.Add(productId);

}

GridView1.DataBind();

}

With the btnRemove codes above, If I clicked it, it'll remove all values in my gridview even the unchecked rows, what I want is that just the checked rows not all. And are there any other simple way of removing rows in a gridview than using checkbox? I am using c# with asp.net. Thanks in advance and God Bless.