check box selected items(or) Values stored in gridview,sqlserver 2008

from this you pass selected value in gridview..\

private void Checked()
{
foreach (GridViewRow row in GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
CheckBox chkRow = (row.Cells[0].FindControl("CheckBox1") as CheckBox);
if (row.Cells[1].Text == this.CustomerId)
{
chkRow.Checked = true;
}
}
}
}

protected void GetSelectedRecords(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[4] { new DataColumn("CustomerID"),
new DataColumn("City"),
new DataColumn("Country"),
new DataColumn("PostalCode") });
foreach (GridViewRow row in GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
CheckBox chkRow = (row.Cells[0].FindControl("CheckBox1") as CheckBox);
if (chkRow.Checked)
{
string customerId = row.Cells[1].Text;
string city = row.Cells[2].Text;
string postalCode = row.Cells[3].Text;
string country = row.Cells[4].Text;
dt.Rows.Add(customerId, city, country, postalCode);
}
}
}

}