Use of SortedList

SortedList
sl = new SortedList();
//creating sorted list.
private voidbtnAdd_Click(object sender, EventArgs e)
{

if(txtValue.Text != "" &&txtKey.Text != "")
      {
            sl.Add(txtKey.Text, txtValue.Text);

//adding key and value to sortedlist.
            txtKey.Text= "";
           txtValue.Text = "";
      }
      else
            MessageBox.Show("Text Box Empty");
}

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