Cast exception in Updation of option set value

Scenario: I am retriving all the records from an entity with a condition and tring to update a value of my option set to another value, if my condition satisfies.
For this I wrote the below code and I am getting an error "system.invalidcastexception.Microsoft Dynamics CRM has experienced an error". Can any tellme where I am exactly missing?

private void CheckIfInworkActions(ICrmContext context,Guid userId)
        {
        
            QueryExpression exe1 = new QueryExpression(avd_masteraction.EntityLogicalName);

            exe1.ColumnSet.AddColumn(XrmAttributes.MasterAction.Status);
          
            exe1.Criteria.AddCondition(XrmAttributes.StatusCode, ConditionOperator.Equal, 100000004);
          
            var coll1 = context.OrganizationService.RetrieveMultiple(exe1);

            foreach (Entity e in coll1.Entities)
          
            {
                if (coll1 != null && coll1.Entities != null && coll1.Entities.Count > 0)
               
                {
                    OptionSetValue myOptionSet = new OptionSetValue();
                    myOptionSet.Value = 100000011;                            

                    e.Attributes[XrmAttributes.StatusCode] = myOptionSet.Value;
                  
                    context.OrganizationService.Update(e);

                }
               

            }
           
        }