Add User to a selected group in SharePoint

SPSecurity.RunWithElevatedPrivileges(delegate()

{

SPWeb currentWeb = SPControl.GetContextWeb(Context);

using (SPSite site = new SPSite(currentWeb.Url))

{

using (SPWeb objWeb = site.OpenWeb())

{

objWeb.AllowUnsafeUpdates = true;

SPUser spUser = objWeb.EnsureUser(peAddUser.Accounts[0].ToString());

if (spUser != null)

{

SPGroup spGroup = objWeb.Groups["Name of Your Group"];

if (spGroup != null)

{

spGroup.AddUser(spUser);

string strUrl=objWeb.Url+"/UserPages/Add User.aspx";

Page.Response.Redirect(strUrl);

}

}

}

}

});