how to get output in json format

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ASP.NET

hi all........

[WebMethod]
 [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
public string Inserttblval(string UserName, int CountryId, int IsActive)
{
int rowsInserted;
SqlConnection conn = new SqlConnection("Data Source=SREENI\\SQLEXPRESS;Initial Catalog=TestDB;User ID=sa;Password=sa123");
string sql = string.Format(@"INSERT INTO [TestDB].[dbo].[Table_1] ([CountryId],[UserName],[IsActive]) VALUES ({0},'{1}',{2})", CountryId,UserName, IsActive);
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
conn.Open();
rowsInserted = cmd.ExecuteNonQuery();
conn.Close();
cmd = null;
return string.Format("CountryId,UserName, IsActive");
}

error is

Error 3 The type or namespace name 'ScriptMethodAttribute' could not be found (are you missing a using directive or an assembly reference?) E:\mine\webserviceasp.net1\App_Code\WebService.cs 39 5 webserviceasp.net1