operator '==' cannot be applied to operand of type bool and

x.unit_id is int :- x.unit_id == 1

or

x.unit_id is string :- x.unit_id == "1"

x.active is bool :- x.active == true

or

x.active is string :- x.active == "true" or "Y"

Also You use && operator instead of & in your query.

{

foreach (UnitType item in Couseunit)

{

if (item.unit_id == 0)

{

item.unit_id = 1;

item.active = true;

}

List Couseunit = new List();

dgCunit.DataSource = Couseunit.Where(x => x.unit_id == 0).ToList();

dgCCCourse.DataSource = Couseunit.Where(x => x.unit_id == 1 & x.active == "Y").ToList();

how can i resolve the error

operator '==' cannot be applied to operand of type bool and string

You can do conversion and then apply it.