foreach(Datarow dr in table.rows)
{
  string str =  dr[0].ToString();
  string str1 =  dr["columnName"].ToString();

}

In C# 

foreach(DataRow dr in dt.rows) //dt is Data table
{

 string ABC= dr["Coloumn_Name"].Tostring;

}

best way to retrieve data is-
//dtTable is Data table
//dtrow id Data Row object


string str;
foreach(DataRow dtrow in dtTable.rows) 
{

 str= dtrow ["emp_Name"].Tostring();
//emp_Name is the column name

// now use str variable as you want to manipulate.
}