foreach (DataRow row in ds.Tables[0].Rows)
{
foreach (var item in row.ItemArray)
{
item="something"
}
}
or alternative with for
for (int i = 0; i < table.Rows.Count; i++)
{
for (int j=0;j<table.Columns.Count;j++)
{
Console.WriteLine(table.Rows[i][j]);
}
}