关于存在外键约束的表的提交问题

我这有三张表，一张type表，一张project表，还有一张account表．
这三张表存在外键约束关系　　type.typeID 1:多　account.typeID  project.pno 1:多　account.pno
我要提交到数据库，可是出现这个问题　ForeignKeyConstraint FK_typeID 要求在父表中存在子键值(0)。
下面是我的代码
public partial class 增加收入 : Form
    {
        SqlConnection conn = DB.DBConnection();
        SqlDataAdapter da1;
        SqlDataAdapter da2;
        SqlDataAdapter da3;
        DataSet ds;        string type = "";
        string money = "";
        DateTime dt = DateTime.Now;
        string describle = "";        public 增加收入()
        {
            InitializeComponent();
        }        private void Form4_Load(object sender, EventArgs e)
        {
            string typeString = "select * from type";
            string accountString = "select * from account";
            string projectSTring = "select * from project";
            da1 = new SqlDataAdapter(typeString, conn);
            da2 = new SqlDataAdapter(accountString, conn);
            da3 = new SqlDataAdapter(projectSTring, conn);
            
            ds = new DataSet();
            da1.Fill(ds, "type");
            da2.Fill(ds, "account");
            da3.Fill(ds, "project");
            DataRelation relation1 = new DataRelation("FK_typeID", ds.Tables["type"].Columns["typeID"], ds.Tables["account"].Columns["typeID"]);
            DataRelation relation2 = new DataRelation("FK_pno", ds.Tables["project"].Columns["pno"], ds.Tables["account"].Columns["pno"]);
            ds.Relations.Add(relation1);
            ds.Relations.Add(relation2);
            ds.EnforceConstraints = true;
                        BaseClass.FillAttribute(comboBox3);
            //BaseClass.FillProject(comboBox5);            dateTimePicker2.Value = dt;
        }        private void button3_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void button4_Click(object sender, EventArgs e)
        {
            type = comboBox3.SelectedIndex.ToString().Trim();
            money = textBox2.Text.Trim();
            dt = dateTimePicker2.Value;
            describle = richTextBox2.Text.Trim();            DataRow row = ds.Tables["account"].NewRow();
            row["rdate"] = dt;
            row["typeID"] = type;
            row["describle"] = describle;
            row["money"] = money;
            ds.Tables["account"].Rows.Add(row);            SqlCommandBuilder scb1 = new SqlCommandBuilder(da1);
            SqlCommandBuilder scb2 = new SqlCommandBuilder(da2);
            SqlCommandBuilder scb3 = new SqlCommandBuilder(da3);
            da1.Update(ds.Tables["type"]);
            da3.Update(ds.Tables["project"]);
            da2.Update(ds.Tables["account"]);
            ds.AcceptChanges();
            MessageBox.Show("提交成功", "老树提醒");
        }        private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
        {
            BaseClass.FillProject(comboBox3, comboBox5);
        }
    }本人现在非常急，急着交作业，哪位赶紧看下啊～提个意见
谢谢