C# Code to Perform SharePoint Group Specific Operations

C# code to find SharePoint web application Group's. 

public List<NameValuePair> GetGroups(string siteUrl)
 {
     List<NameValuePair> groups = new List<NameValuePair>();

     using (SPSite site = new SPSite(siteUrl))
     {

         using (SPWeb web = site.OpenWeb())
         {
             foreach (SPGroup group in web.Groups)
             {
                 groups.Add(new NameValuePair() { Value = group.Name, Name = group.Name });
             }
         }
     }

     return groups;
 }

C# code to find SharePoint web application Group owner names. 

public List<NameValuePair> GetGroupsWithOwner(string siteUrl)
{
    List<NameValuePair> groups = new List<NameValuePair>();

    using (SPSite site = new SPSite(siteUrl))
    {

        using (SPWeb web = site.OpenWeb())
        {
            string ownerName = string.Empty;
            foreach (SPGroup group in web.Groups)
            {

                if (group.Owner is SPUser)
                {
                    ownerName = (group.Owner as SPUser).Name;
                }
                else if (group.Owner is SPGroup)
                {
                    ownerName = (group.Owner as SPGroup).Name;
                }
                groups.Add(new NameValuePair() { Value = group.Name, Name = string.Format("{0} ({1})", group.Name, ownerName) });
            }
        }
    }

    return groups;
}

C# code to remove specific group from given web application. 

public List<NameValuePair> RemoveGroups(List<string> groups, string siteUrl)
{
    List<NameValuePair> groupstatus = new List<NameValuePair>();

    using (SPSite site = new SPSite(siteUrl))
    {

        using (SPWeb web = site.OpenWeb())
        {
            NameValuePair groupstat;

            foreach (string group in groups)
            {
                groupstat = new NameValuePair();
                try
                {
                    web.Groups.Remove(group);
                    groupstat.Name = string.Format("{0} removed sucessfully.", group);
                    groupstat.Value = true;
                }
                catch (Exception ex)
                {
                    groupstat.Name = string.Format("Error {1} while removing gorup {0}", group, ex.Message);
                    groupstat.Value = false;
                }

                groupstatus.Add(groupstat);
            }
        }
    }

    return groupstatus;
}

C# code to add user to web application. 

public bool AddUserToGroup(string siteUrl, string groupName, string memberName)
{
    bool isOwnerUpdated = false;
    using (SPSite site = new SPSite(siteUrl))
    {
        using (SPWeb web = site.OpenWeb())
        {


            try
            {
                SPUser user = web.EnsureUser(memberName);
                SPGroup group = web.Groups[groupName];
                group.AddUser(user);
                group.Update();
            }
            catch (Exception ex)
            {
            }
        }
    }

    return isOwnerUpdated;

}

C# code to set owner for web application. 

public bool SetOwnerToGroup(string siteUrl, string groupName, string ownerName, bool isGroup)
{
    bool isOwnerUpdated = false;

    using (SPSite site = new SPSite(siteUrl))
    {
        using (SPWeb web = site.OpenWeb())
        {
            try
            {
                SPGroup group = web.Groups[groupName];
                SPMember owner;
                owner = web.Groups[ownerName];
                group.Owner = owner;
                group.Update();
            }
            catch (Exception ex)
            {
                isOwnerUpdated = false;

            }
        }
    }
    return isOwnerUpdated;
}

C# code to get group members. 

public List<NameValuePair> GetGroupMembers(string siteUrl, string groupName)
{
    List<NameValuePair> groupMembers = new List<NameValuePair>();

    using (SPSite site = new SPSite(siteUrl))
    {

        using (SPWeb web = site.OpenWeb())
        {
            NameValuePair groupMember;

            SPGroup group = web.Groups[groupName];

            foreach (SPUser user in group.Users)
            {
                groupMember = new NameValuePair();
                groupMember.Value = groupMember.Name = user.Name;

                groupMembers.Add(groupMember);
            }
        }
    }

    return groupMembers;
}

C# code to check valid users. 

public bool IsValidUser(string UserName, SPWeb web)
{
    SPAdministrationWebApplication centralAdmin = SPAdministrationWebApplication.Local;

    SPPrincipalInfo principle = SPUtility.ResolvePrincipal(centralAdmin, SPUrlZone.Default, UserName,
        SPPrincipalType.User, SPPrincipalSource.All, false);
    //( web , SPUrlZone.Default, UserName, SPPrincipalType.User, SPPrincipalSource.All, false);

    if (principle == null)
        return false;
    return true;
}