SqlCommandBuilder Constructor didn't take arguement - DataAdapter arguement?

When i passed da - SqlDataAdapter object as an arguement on SqlCommandbuilder Constructor, i got squiggly line under new SqlCommandBuilder(da) with that error message. SHouldnt SqlCommad builder should take DataAdapter as an arguement?? even i checked that on MSDN it supposed to .

public partial class SqlCommandBuilder : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{


}

protected void btnLoad_Click(object sender, EventArgs e)
{
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
string sqlQuery = "Select * from tblStudent where ID = " + txtID.Text;
SqlDataAdapter da = new SqlDataAdapter(sqlQuery, con);
DataSet ds = new DataSet();
da.Fill(ds, "tblStudent");

ViewState["Sql_Query"] = sqlQuery;
ViewState["DataSet"] = ds;
if (ds.Tables["tblStudent"].Rows.Count > 0)
{
DataRow drw = ds.Tables["tblStudent"].Rows[0];
txtName.Text = drw["Name"].ToString();
ddlGender.SelectedValue = drw["Gender"].ToString();
txtTotalMark.Text = drw["TotalMarks"].ToString();
}
else
{
lblMessage.Text = "No student record with ID : " + txtID.Text;
}
}
}

protected void btnUpload_Click(object sender, EventArgs e)
{
string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
SqlDataAdapter da = new SqlDataAdapter((string)ViewState["Sql_Query"],con);
SqlCommandBuilder builder = new SqlCommandBuilder(da);


}

if that's helpful to u