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I think about how to add a from lookup value to the text ? How can I write it to another colum ? In the same list.

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Yes :), only Value from lookup field. – Grzegorz Z Nov 28 '12 at 10:03
And how get a LookupField in Event Receiver ? – Grzegorz Z Nov 28 '12 at 11:25
but why LookupListName_x003a_ID ? Why why wrait it pernamently ? :) – Grzegorz Z Nov 28 '12 at 12:40
Post it as answer but please first in Your answer tell why we write it pernamently. I don't geret why we write here LookupListName_x003a_ID as pernamently value :) – Grzegorz Z Nov 28 '12 at 12:53
In my example it should be "Procent_x003a_Identyfikator" – Grzegorz Z Nov 28 '12 at 13:01
up vote 1 down vote accepted

You can extend the ID column into the Child List from Lookup Fields... If you go to Site Settings -> Click lookup Column -> In section "Add a column to show each of these additional fields" check ID field!

Then in code you can access it like:


Replace "LookupListName" with the Lookup List's name in your case!

When you extend a column from Lookup field, the name of the field in your list becomes like: LookupListName:FieldName so if you extend ID field, the field name will be LookupListName:ID

Now when you access the fields in code, you need to use Internal Names and all the special characters are replaced by some code... code for ':' is 'x003a', so when you try to access the field in code you will write:
LookupListName_x003a_ID instead of LookupListName:ID

You can see complete code conversions here:
SharePoint Column/Field Display Names vs Internal Names

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        SPList list = web.Lists.TryGetList("Your list");
        SPListItem item = list.GetItemByID(ID);
        SPFieldLookupValue fieldLookupValue = new SPFieldLookupValue(item["FieldName"].ToString());
        int lookupID = fieldLookupValue.LookupId;
        string lookupValue = fieldLookupValue.LookupValue;
        item["TextFieldName"] = lookupValue

If I have understood the question correctly...

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And how get the fields in Event Receiver ? – Grzegorz Z Nov 28 '12 at 11:32
public override void ItemUpdated(SPItemEventProperties properties) { base.ItemUpdated(properties); SPListItem item = properties.ListItem; – Grooverinthesouth Nov 29 '12 at 12:12

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