SqlParameter help

I've got a database object that I use for my connection layer and in this layer I'm attempting to involve the use of sql parameters. My problem is that I'm making it very general so that it can be easily reused.  Here is my code.

            public void Insert(Hashtable ht)
            {
                  SqlDataAdapter sd = new SqlDataAdapter();
                  sd.InsertCommand = this.myConnection.CreateCommand();
                  sd.InsertCommand.CommandText = this.sql;
                  this._addParams(sd.InsertCommand, ht);
                  sd.InsertCommand.ExecuteNonQuery();
                  
            }

            private void _addParams( SqlCommand cmd, Hashtable ht)
            {
                  IDictionaryEnumerator myEnum = ht.GetEnumerator();
                  while(myEnum.MoveNext())
                  {
                        cmd.Parameters.Add("@" + myEnum.Key.ToString(), myEnum.Key.ToString());
                        cmd.Parameters["@" + myEnum.Key.ToString()].Value = myEnum.Value.ToString();
                  }
            }

My question is that normally this line:
cmd.Parameters.Add("@" + myEnum.Key.ToString(), myEnum.Key.ToString());

would have 4 parameters that would include a SqlDbType parameter and a length. Because this is general I left it out. Am I still inviting sql Injection as a possible problem?  

Anyone have some ideas on how to make this more robust?

Thanks
LVL 3
jayrodAsked:
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ptmcompCommented:
- You can't do SQL injection over sql parameters. Your code is safe so far.
- Provide only datareader and if needed datawriter rights to the database user.
- Your data is not typed if you do it that way.
- Test your code and try to do sql injection (e.g. 10'; shutdown; when logged in as "sa" - what you never should be...). More information here: http://www.nextgenss.com/papers/advanced_sql_injection.pdf
- The user could also do HTML/Javascript injection. Are you showing any data in the web browser? Be sure to filter or encode it.
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