Shall I assign the dataset values to user-defined variables ?

string Val="";
//Check dataset Tables Count like:
Dataset ds=new Dataset();
if(ds.Tables.Count > 0)
{
  // Check Rows Count in Each Table like
  if(ds.Tables[0].Rows.Count > 0)
  {
     //Retrieve value like
     Val=ds.Tables[0].Rows[0]["Field1"].Tostring();
  }
}