GeneralLink in Sitecore

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You should be careful using linkField.Url since it it will incorrectly render internal links to Sitecore Items and Media. You should instead be using Sitecore.Links.LinkManager.GetItemUrl(item) and Sitecore.Resources.Media.MediaManager.GetMediaUrl(item) for those.

It would be better to have a helper (extension) method to return the correct url for you, based on the type of link. Take a look this Sitecore Links with LinkManager and MediaManager blog post which has the correct code you need for this.

For reference:

public static String LinkUrl(this Sitecore.Data.Fields.LinkField lf)
{
    switch (lf.LinkType.ToLower())
    {
      case "internal":
        // Use LinkMananger for internal links, if link is not empty
        return lf.TargetItem != null ? Sitecore.Links.LinkManager.GetItemUrl(lf.TargetItem) : string.Empty;
      case "media":
        // Use MediaManager for media links, if link is not empty
        return lf.TargetItem != null ? Sitecore.Resources.Media.MediaManager.GetMediaUrl(lf.TargetItem) : string.Empty;
      case "external":
        // Just return external links
        return lf.Url;
      case "anchor":
        // Prefix anchor link with # if link if not empty
        return !string.IsNullOrEmpty(lf.Anchor) ? "#" + lf.Anchor : string.Empty;
      case "mailto":
        // Just return mailto link
        return lf.Url;
      case "javascript":
        // Just return javascript
        return lf.Url;
      default:
        // Just please the compiler, this
        // condition will never be met
        return lf.Url;
    }
}

Usage:

Sitecore.Data.Fields.LinkField linkField = item.Fields["Link1"];
lnkMain.NavigateUrl = linkField.LinkUrl();

It would be best of course to use <sc:FieldRender> control and let Sitecore handle it for you, but it looks like you do not have that option.

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