ASP.NET

protected void ProductDataSource_Selecting( object sender, ObjectDataSourceSelectingEventArgs e ) {
            e.InputParameters["productGroup"] = <here I need to access the GroupName from the OuterGridView>;
}

string text1 = "";
    string text2 = "";


 private void insertfiles()
    {

        foreach (RepeaterItem item in Rptdescription.Items)
        {
            TextBox txt1 = (TextBox)item.FindControl("TextBox1");
            TextBox txt2 = (TextBox)item.FindControl("TextBox3");
            text1 += txt1.Text + "|";
            text2 += txt2.Text + "|";
       }
                    
        foreach (string split2 in text2.Split('|'))
        {
            stringList.Add(split2 + "<br/>");
            SqlConnection SqlCnn = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"]);
            SqlCommand SqlCmd = new SqlCommand();
            SqlCmd.Connection = SqlCnn;
            SqlCnn.Open();
            SqlCmd.CommandText = "insert into test(test,id) values(@test,1)";
            SqlParameter DataBaseID = new SqlParameter("@test", SqlDbType.NVarChar, 50);
            DataBaseID.Value = stringList.Add(split2);
            SqlCmd.Parameters.Add(DataBaseID);
           
            SqlCmd.ExecuteNonQuery();
            SqlCnn.Close();
            Bindrepeater();
        }
   //ignore syntax errors