C# รบกวนสอบถาม การดึงข้อมูลจาก Sql Server มาใส่ตัวแปร เพื่อใช้คำนวณหน่อยครับ

	SqlConnection objConn = new SqlConnection();
	SqlCommand objCmd = new SqlCommand();
	SqlDataReader dtReader;
	String strConnString,strSQL;

    void Page_Load(object sender,EventArgs e)
	{
		strConnString = "Server=localhost;Uid=sa;PASSWORD=;database=mydatabase;Max Pool Size=400;Connect Timeout=600;";
		objConn = new SqlConnection(strConnString);
		objConn.Open();

		//*** DataTable ***//
		SqlDataAdapter dtAdapter;
		DataTable dt = new DataTable();
		strSQL = "SELECT * FROM customer WHERE CustomerID = '"+ Request.QueryString["CustomerID"] +"' ";
		dtAdapter = new SqlDataAdapter(strSQL, objConn);
		dtAdapter.Fill(dt);

		if(dt.Rows.Count > 0)
		{
			this.txtCustomerID.Text = (string)dt.Rows[0]["CustomerID"];
			this.txtName.Text = (string)dt.Rows[0]["Name"];
			this.txtEmail.Text = (string)dt.Rows[0]["Email"];
			this.txtCountryCode.Text = (string)dt.Rows[0]["CountryCode"];
			this.txtBudget.Text = (string)dt.Rows[0]["Budget"].ToString();
			this.txtUsed.Text = (string)dt.Rows[0]["Used"].ToString();
		}
	}