急求richtextbox中有文字和图片混合怎么存到数据库

//保存
private void button1_Click(object sender, EventArgs e)
{



MemoryStream ms = new MemoryStream();
richTextBox1.SaveFile(ms, RichTextBoxStreamType.RichText);
byte[] bWrite = ms.ToArray();
bool boo= SqlHelper.ExecuteNonQuery(CommandType.Text,"insert Images values('"+bWrite+"')",null);
if (boo==false)
{
MessageBox.Show("");
}
richTextBox1.Rtf = "";
}
//读取
private void button2_Click(object sender, EventArgs e)
{

string sql = "select * from Images";
Byte[] bytes =(byte[]) SqlHelper.ExecuteScalar(CommandType.Text, sql, null);
MemoryStream ms = new MemoryStream(bytes, false);
richTextBox1.LoadFile(ms, RichTextBoxStreamType.RichText); //我用的这个方法这里总是报错说文件格式无效


}