Can not convert from object type 'System.Data.DataRowView' to type 'Sy

Question

Can not convert from object type 'System.Data.DataRowView' to type 'System.String' error coming please fix.

string _fileName = @"D:\Personal\Documents\SalaryDetails.txt";
           StreamWriter writer = new StreamWriter(_fileName);
           for (int i = 0; i < lst.Items.Count; i++)
           {
               writer.WriteLine(Convert.ToString(lst.Items[i]));
           }
           writer.Close();