Want a way to check the users current security permission group membership? No? Well…this is awkward………. I’m going to ignore you.

In the Namespace deceleration, add this bad boy here. It make sure your C# knows what to do when looking for user permissions group.

using Microsoft.SharePoint;

Then we’re going to actually add our code within the rest of your class.

#region Check Permissions of user
 protected bool CheckIfCurrentUserInGroup(string sGroups)
 {
 bool bSecure = false;
 string[] groups = sGroups.Split(',');

 foreach (string group in groups)
 {
      if (SPContext.Current.Web.SiteGroups[group].ContainsCurrentUser)
      {
          bSecure = true;
          break;
      }
 }
return bSecure;
 }
 #endregion

Now all you should need to do is call

CheckIfCurrentUserInGroup()

And pass in the name of the user permissions group you want to check on.

Sample

#region Check Permissions of current user
private void CheckPermissions()
{ 
     bool bCanDisplay = false;

try
{
     bCanDisplay = CheckIfCurrentUserInGroup("Visitor");

      #region If Statement
      //Display button if the user is withing the group(s).
if (bCanDisplay)
      {
        genPDFlnkButton.Visible = true;
      }
      else
      {
        genPDFlnkButton.Visible = false;
      }
      #endregion
 }
 catch (Exception e)
 {
      handleErrors(e.ToString());
 }
}
 #endregion

#region Check Permissions of user
 protected bool CheckIfCurrentUserInGroup(string sGroups)
 {
 bool bSecure = false;
 string[] groups = sGroups.Split(',');

 foreach (string group in groups)
 {
      if (SPContext.Current.Web.SiteGroups[group].ContainsCurrentUser)
      {
          bSecure = true;
          break;
      }
 }
return bSecure;
 }
 #endregion