Get lookup field values in list and put into Array

string lookupValue = "1;#Lookup A;#2;#Lookup B;#3;#Lookup C;#4;#Lookup D"

string lookupValue= listItem["Columnname"].ToString();
string[] lookupValueArray = lookupValue.Split(new string[] { ";#" }, StringSplitOptions.RemoveEmptyEntries);

ArrayList lookupValueArrayList = new ArrayList();
for (int i = 0; i < lookupValueArray.Length; i++)
{
  i++;
  lookupValueArrayList.Add(lookupValueArray[i].ToString());
}