Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource

Question

I have a query like the following:

var count = db.Employees.Count (x =>(x.Salary >0));
Grid1.DataSource = count.ToString();
Grid1.DataBind();

It is working fine. However, why is Grid displaying the output column by column?

Answer 1

Your query returns an int . You can't use an integer as datasource for a gridview. The error-message is self-explanatory: the DataSource must be a type that implements IListSource , IEnumerable or IDataSource (a GridView usually displays multiple items).

Maybe you want to use Where instead of Count :

var employeeWithSalary = db.Employees.Where(x => x.Salary > 0);
Grid1.DataSource = employeeWithSalary;
Grid1.DataBind();