private void Button1_Click(object sender, System.EventArgs e)         {             if(this.IsValid){             OleDbConnection conn=dbconn.createconn();                 conn.Open();                 OleDbCommand cmd=new OleDbCommand();                 cmd.CommandText="insert into a(title,content)values('"+this.title.Text.Trim().Replace("'","")+"','"+this.content.Text.Trim().Replace("'","")+"')";                 cmd.Connection=conn;                 try                 {                     cmd.ExecuteNonQuery();                     this.title.Text="";                     this.content.Text="";                     this.add_info.Text="提交成功";                 }                 catch                 {                     this.add_info.Text="出现错误";                                     }                 finally{                 conn.Close();                 }             }         }