Question

If I have a query

var query = from c in ds.Prices
            select c;
dataGridControl1.AutoCreateColumns = true;
dataGridControl1.ItemsSource = query;

datagrid show all data from table(`ds = new DataSet()). But when I add condition

var query = from c in ds.Prices
            where c.idsticker.Equals("GOOG")
            select c;
dataGridControl1.AutoCreateColumns = true;
dataGridControl1.ItemsSource = query;

datagrid is empty. But value GOOG exists in table(idsticker varchar(10) in sql server). When I compare int values(for example condition is where c.prices > 660) it works normal.

What is wrong?

Answer 1

All I can think of is to apply a Trim() to it, and possibly ToUpper() to see if one or both of those makes any difference.

var query = from c in ds.Prices 
            where c.idsticker.Trim().ToUpper().Equals("GOOG") 
            select c; 
dataGridControl1.AutoCreateColumns = true; 
dataGridControl1.ItemsSource = query; 

Beyond that, try executing the same query using SQL against your database.

select * from prices where idsticker = 'GOOG'