我开始学C#

Question

高手请教:
什么是类!

Answer 1

string db = "db1.mdb";
        string strcon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath(db) + "";
        OleDbConnection cnn = new OleDbConnection(strcon);
        string sql = "insert into news values(id=@id,title=@title,content=@content,addtime=@addtime,view=@view)";
        OleDbCommand cmd = new OleDbCommand(sql, cnn);
        cmd.Parameters.Add(new OleDbParameter("@title", OleDbType.Char, 100));
        cmd.Parameters["@title"].Value = TextBox1.Text.ToString();
        cmd.Parameters.Add(new OleDbParameter("@content", OleDbType.Char, 220));
        cmd.Parameters["@content"].Value = TextBox2.Text.ToString();
        cmd.Parameters.Add(new OleDbParameter("@addtime", OleDbType.Date, 4));
        cmd.Parameters["@addtime"].Value = TextBox3.Text.ToString();
        cmd.Parameters.Add(new OleDbParameter("@view",OleDbType.Integer,4));
        cmd.Parameters["@view"].Value=TextBox4.Text.ToString();
        cnn.Open();
        try
        {
            cmd.ExecuteNonQuery();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        finally 
        {
            cnn.Close();
        }
        
    }
错误在哪儿