Redirect webpart in sanboxed solution
using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
namespace MyWebpart
{
[ToolboxItemAttribute(false)]
public class ConsentsApprover : WebPart
{
protected override void CreateChildControls()
{
Controls.Add(new Literal()
{
Text = @"<script type=""text/javascript"">location='your_redirect_url';</script>"
});
}
}
}