for loop for fill dataset values

// Get the data table.
   foreach (DataRow row in ds.Tables[0].Rows) // Loop over the rows.
   {

       foreach (var item in row.ItemArray) // Loop over the items.
       {
                  //do actions or assign values
                   item="something"
       }
   }

for (int i = 0; i < table.Rows.Count; i++)
           {
               for (int j=0;j<table.Columns.Count;j++)
               {
                   Console.WriteLine(table.Rows[i][j]);
               }
           }