How Do I Delete All Records In Sql Using Condition&LINQ

i have web form .in which i have button to delete all records against one date.there are two fields in the form,one drop down list where all sector are given,and is a date.when user select a sector and put a date in the field,and click on delete button then all record will be deleted.c# code is as follow,i want linq statement in which i can use where clause.

 

protected void Clear_Roaster(object sender, EventArgs e)
 {             int sectorId = SafeConvert.ToInt32(ddlsectorRoaster.SelectedValue);      
       DateTime dt = SafeConvert.ToDateTime(txtDate.Text);            
    _service.DeleteEmployeeStatus(sectorId);   
        }