c# - Validate TextBox for Existing data in SQL -

i trying validate inputs database. user should not able save same title twice.

i using code:

private bool exists() {     var entity = factory.definitions.calculationparameters.list();          // list() lists values of existing data.      if (aspvalidators.validatetextboxes(titletextbox)) //validates textbox string     {         return entity.where(item => item.title == titletextbox.text);     } } 

now @ item => ... part i'm getting error :

cannot implicitly convert type 'system.collections.generic.ienumerable' 'bool'.

i don't know do. please?

so problem of return type of code

private bool exists() 

you returning 'system.collections.generic.ienumerable not of bool type.

you can use way

return entity.any(item => item.title == titletextbox.text);