Choice values from SharePoint List C#

public void createCategoryColumnType(SPList list)

        {

            List<string> Choices = null;

            SPFieldChoice fieldChoice = (SPFieldChoice)list.Fields.GetFieldByInternalName("Category");

             Choices = new List<string>();

             foreach (string choiceName in fieldChoice.Choices)

             {

                 Choices.Add(choiceName);

             }

          

        }

Split URL with last slash of URL

Get last value of a URL

var myURL:  "http://ravimaloth:/abcd/rkm/ssts/Word_Thesis_091.ppt" ;
Requirement to get value: Word_Thesis_091.ppt

var fileName = myURL..match(/[^/]*$/)[0];

Add group to the list with View only permissions

Add group to the list with  View only (Role definition)- permissions

  webElevated.AllowUnsafeUpdates = true;

                string libGrpName = list.Title + "_ViewOnly";

                SPGroup grp = webElevated.SiteGroups[libGrpName];

SPRoleAssignment roleAssignmentAdmin = new SPRoleAssignment((SPPrincipal)grp);

                SPRoleDefinition roleAdmin = webElevated.RoleDefinitions["View only"];

                roleAssignmentAdmin.RoleDefinitionBindings.Add(roleAdmin);

                list.RoleAssignments.Add(roleAssignmentAdmin);

                list.Update();

                webElevated.AllowUnsafeUpdates = false;