Linq to Sql escape WHERE clause

Question

I have this Linq-to-SQL query

  DaynamicContext.Log = new System.IO.StreamWriter("f:\\linq-to-sql.txt") { AutoFlush = true })
  var tt = DaynamicContext.GetTable(tbl);
  var query = ((from c in tt where c.IsDeleted != true select c.Id).Take(1)).ToList();

The result of final query is correct is got only single Id.

The problem when I have big data I got out of memory exception.

When I checked the generated query

SELECT [t0].[Id], [t0].[CreatedBy], [t0].[CreatedDate], [t0].[ModifiedBy], 
[t0].[ModifiedDate], [t0].[IsDeleted], [t0].[UntileTime], [t0].[Desktop], 
[t0].[Laptop], [t0].[Title], [t0].[Responsive], [t0].[Mobile], [t0].[ActiveTime],
[t0].[Tablet]
FROM [Countent_FreeArea] AS [t0]

it seems like Linq-to-SQL is getting all data from database and filtering it on memory.

public class Context
{
    private DataContext daynamicContext;
    public DataContext DaynamicContext
    {
        get
        {
            if (daynamicContext == null)
            {
                System.Configuration.ConnectionStringSettingsCollection connectionStrings = WebConfigurationManager.ConnectionStrings;
                daynamicContext = new DataContext(connectionStrings["connectionStrings"].ToString());
            }
            return daynamicContext;
        }
    }
}

Answer 1

The GetTable method will fetch the whole table first and then select the first value from the list. Also instead of using Take() , use FirstOrDefault() .