Cannot implicitly convert type 'int' to 'string'

Hi guys,

I am new to C# and ASP.Net.

I need your suggestion on an issue.

After clicking the Button, I grab request.querystring value which is an e-mail address from url and also I get RadioButtonList1.Text value which comes from a survey.

I want to insert those two values into database using dataset but I get the following error.

CS0029 :   Cannot implicitly convert type 'int' to 'string'1 string txtMail = Convert.ToString(Request.QueryString["mail"]);
2
3 AnketSonucTableAdapter sonuc =
4 new AnketSonucTableAdapter();
5
6 string insert_query = sonuc.InsertQuery
7 (RadioButtonList1.Text, txtMail);
8 ...