Pragmatically(Using C#) check if particular exist in a group

Below is a snippet which might be helpful

bool flag=false;

SPSite site = SPContext.Current.Site;
using (SPWeb web = site.OpenWeb())
{
   SPUser currentUser = web.EnsureUser("Domain\UserLogin");
   SPGroupCollection userGroups = currentUser.Groups;
   foreach (SPGroup group in userGroups)
   {
     if (group.Name.Contains("SharePoint Group Name"))
        {
                //User belongs to the group     
                flag=true;
                break;
        }       
   }
}

if(flag==false)
{
        //Add user to the group
        
}

I have not tested this, please check for any build errors and test, if it suits your needs..

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Ram Prasad Meenavalli | MCITP | MCTS SharePoint | MCPD SharePoint | http://ift.tt/1iDFivl