Set value of SPFieldLookup programmatically

Hi,
I have a situation wherein when I add an item in List A in website A, same item needs to be added in List B in website B(Both the list have same meta data of course).
I have an event handler and registered it for List A, wherein in Item Added event of List A, I am also adding an item in List B. Now both the lists contain a look up field.
So when I try to update the lookupfield of listitem in List B with the value I get from listitem of List A which comes in "no;#value" format, I am not able to .
So exactly how should I update a lookupfield?
Thanks, Tejas

Hi,
Sharepoint keeps look up fields in the format of "ID;#FieldValueToDispaly". SP uses ";#" as a seperator for id and value. So when you want to save the value to look up field use SPFieldLookupValue class object.
string lookUpValue = ListAItem["LookUpFieldName"];
string[] value = lookUpValue.Split(new char[] { ';', '#' });
SPFieldLookupValue fieldLookupValue = new SPFieldLookupValue(Convert.ToInt32(value[0]), value[1]);
ListBItem["LookUpFieldName"] = fieldLookupValue;

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