How to change the Workflow History list programmatically?

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    1: SPSite spSite = new SPSite("https://localhost");

    2: SPWeb spWeb = spSite.OpenWeb();

    3: SPList spList = spWeb.Lists["Shared Documents"];

    4: SPList workflowlist = spWeb.Lists["NewHistoryLibary"];

    5: SPWorkflowAssociation association = spList.WorkflowAssociations[0];

    6: association.SetHistoryList(workflowlist);

    7: spList.UpdateWorkflowAssociation(association);