“Both DataSource and DataSourceID are defined” error using ASP.NET GridView

Question

\"Both DataSource and DataSourceID are defined on \'grdCommunication\'. Remove one definition.\"

I just got this error today, the code has been working until this after

Answer 1

I ran into the same error, but a totally different problem and solution. In my case, I'm using LINQ to SQL to populate some dropdown lists, then caching the results for further page views. Everything would load fine with a clear cache, and then would error out on subsequent page views.

if (Cache["countries"] != null)
{
    lbCountries.Items.Clear();
    lbCountries.DataValueField = "Code";
    lbCountries.DataTextField = "Name";
    lbCountries.DataSource = (Cache["countries"]);
    lbCountries.DataBind();}
else
{
    var lstCountries = from Countries in db_read.Countries orderby Countries.Name select Countries;
    lbCountries.Items.Clear();
    lbCountries.DataValueField = "Code";
    lbCountries.DataTextField = "Name";
    lbCountries.DataSource = lstCountries.ToList();
    lbCountries.DataBind();

    Cache.Add("countries", lstCountries, null, System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(0, 240, 0), System.Web.Caching.CacheItemPriority.High, null);
}

The issue came from: Cache.Add("countries", lstCountries, null, System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(0, 240, 0), System.Web.Caching.CacheItemPriority.High, null);

When it should have been: Cache.Add("countries", lstCountries.ToList(), null, System.Web.Caching.Cache.NoAbsoluteExpiration, new TimeSpan(0, 240, 0), System.Web.Caching.CacheItemPriority.High, null);