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Belows are the code form Ishai’s blog

Example 1: Set the url field of a link

Use the SPFieldUrlValue class to create an object that holds the url to link to, and the title to display:

SPList list = web.Lists[“Links”];

SPListItem newLink = list.Items.Add();

SPFieldUrlValue value = new SPFieldUrlValue();

value.Description = “test”;

value.Url = “http://www.microsoft.com/sharepoint”;

newLink[“URL”] = value;

newLink.Update();

Example 2: Get the url field of a link

Use the SPFieldUrlValue class to create an object that gets the url and description:

SPList list = web.Lists[“Links”];

SPListItem existingLink = list.Items[0];

SPFieldUrlValue value = new SPFieldUrlValue(existingLink[“URL”].ToString());

string linkTitle = value.Description;

string linkURL = value.Url;

Example 3: Set the value of a lookup field for a known title and ID

Use SPFieldLookupValue to set the value of a lookup field (“Group Name”) to item “Program Operations”, whose ID is 14:

SPList list = web.Lists[“Branches”];

SPListItem newBranch = list.Items.Add();

newBranch[“Title”] = “A New Branch”;

SPFieldLookupValue newValue = new SPFieldLookupValue(14,”Program Operations”);

newBranch[“Group Name”] = newValue;

newBranch.Update();

Example 4: Get the value of a lookup field from an item

Reading the value of the group name field (which is a lookup field in the branches list):

SPList list = web.Lists[“Branches”];

SPListItem existingBranch = list.Items[0];

SPFieldLookupValue group = new SPFieldLookupValue(existingBranch[“Group Name”].ToString());

int lookedUpItemID = group.LookupId;

string lookedUpItemTitle = group.LookupValue;

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