webpart is working on local server but not working on production when "SPSite" class is uesd in the webpart

webpart is working on local server but not working on production server when "SPSite" class is uesd in the web part. On the production server it throws error. If I do not use that class in the webpart the web part also works on live machine.

Any idea what might be causing the error?

the code in the webpart is this:

namespace CompanyNews
{
    [Guid("40de3c60-9e30-4050-b9f3-01e71868f522")]
    public class CompanyNews : System.Web.UI.WebControls.WebParts.WebPart
    {
        private HtmlTextWriter writer;
        public CompanyNews()
        {
        }
        protected override void RenderContents(HtmlTextWriter writer)
        {
            base.RenderContents(writer);
            using (SPSite site = SPContext.Current.Site)
            {
                using (SPWeb web = site.OpenWeb())
                {
                    string listName = "News Display";
                    writer.Write(listName);
                    SPList list = null;
                    foreach (SPList currentList in web.Lists)
                    {
                        if (currentList.Title.Equals(listName,
                                                     StringComparison.InvariantCultureIgnoreCase))
                        {
                            list = currentList;
                            break;
                        }
                    }
                    writer.WriteBeginTag("ul");
  开发者_运维百科                  foreach (SPListItem item in list.Items)
                    {                    
                        writer.Write("<li style=\"font-size:12px;padding:1px\">");
                        writer.Write(item["Title"].ToString() + "...   ");
                        writer.Write("<a class=\"smallerred\" href=\"#\">Read More</a>");
                        writer.Write("</li>");
                    }
                    writer.WriteEndTag("ul");
                }
            }
        }

    }
}

The dll of the webpart is in the bin folder and in the web.config file there is an entry for the web par as a safe control. Other webpart which displays a "hellow world" message is also uploaded to production the same way. I i guess its the code that is causing the problem.

The error message is: "An error occurred while previewing the web part"

just something I noticed, you shouldn't wrap objects from the Current Context in a using statement. Good article here Clicky

Better practice would be to use the following

using (SPSite mySite = new SPSite(SPContext.Current.Site.Url))
{
...
} 

Also you should look at packaging up your solution in a WSP, allowing stsadm to deploy it. Dragging into the GAC isn't very good practice.

Shane

The SPSite object isn't getting reference anywhere that I can see. Why don't you remove it anyway as it's superflous to your needs?

SPWeb web = SPContext.Current.Web;  
                string listName = "News Display"; 
                writer.Write(listName); 
                SPList list = null; 
                foreach (SPList currentList in web.Lists) 
                { 
                    if (currentList.Title.Equals(listName, 
                                                 StringComparison.InvariantCultureIgnoreCase)) 
                    { 
                        list = currentList; 
                        break; 
                    } 
                } 
                writer.WriteBeginTag("ul"); 
                foreach (SPListItem item in list.Items) 
                {                     
                    writer.Write("<li style=\"font-size:12px;padding:1px\">"); 
                    writer.Write(item["Title"].ToString() + "...   "); 
                    writer.Write("<a class=\"smallerred\" href=\"#\">Read More</a>"); 
                    writer.Write("</li>"); 
                } 
                writer.WriteEndTag("ul");