Dataset with where Clause

On A button Click event we get all the Values of Customer Table(CustomerName, CustomerAddress, CustomerAge, CustomerPhone) through Customer ID which is present in the Query String.

protected void btnGet_Click(object sender, EventArgs e)
{
int customerid = Convert.ToInt32(Request.QueryString["CustomerId"].ToString());
SqlParameter objParameter = new SqlParameter();
SqlCommand objCommand = new SqlCommand();
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["test"].ConnectionString);
SqlDataAdapter da = new SqlDataAdapter("SELECT CustomerID, CustomerName, CustomerPhone, CustomerAddress, CustomerAge " +
"FROM Customer where CustomerID=@CustomerID", conn);
da.SelectCommand.Parameters.Add(new SqlParameter("@CustomerID", customerid));
da.SelectCommand.Parameters["@CustomerID"].Value = customerid;
DataSet ds = new DataSet();
da.Fill(ds, "Customer");
foreach (DataRow pRow in ds.Tables["Customer"].Rows)
{
tbxCustomerName.Text = pRow["CustomerName"].ToString();
tbxCustomerPhone.Text = pRow["CustomerPhone"].ToString();
tbxCustomerAddress.Text = pRow["CustomerAddress"].ToString();
tbxCustomerAge.Text = pRow["CustomerAge"].ToString();
}
}