C#

public async Task SomeFunc()
{
	await Task.Run(() =>
	{
		// Some Sync method calls here like..
		var reader = com.ExecuteReader();
		...
	}

}
 
// Or

public async Task SomeFunc()
{
	// Some Async method calls here like..
	var reader = await com.ExecuteReaderAsync();
	....
}

protected void updateSal_Click(object sender, EventArgs e)
        {
            newTotal.Text = theLinq.Salary.Single(s => s.Salary_Year == DateTime.Now.Year).Total_Salary.ToString();
        }

Protected Sub updateSal_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim rowsAffected As Integer
    Dim currYear As Integer = Date.Now.Year
        Using con As New SqlConnection("server=.;database=Test;integrated security=true")
     Using cmd As New SqlCommand("UPDATE Salary Set  Total_Salary=@totsal WHERE Salary_Year = @currentYear", con)
           cmd.Parameters.Add("@totsal", SqlDbType.Decimal).Value = newTotal.Text
           cmd.Parameters.Add("@currentYear", SqlDbType.Integer).Value = currYear
           con.Open()
           rowsAffected = cmd.ExecuteNonQuery()
        End Using
       End Using
 End Sub

public class CartInfo
    {
        [Key]
        public int S_NO { get; set; }
        public virtual int Bill_Id { get; set; }
        public virtual int Ship_Id { get; set; }
        public virtual int Product_Id { get; set; }
        [ForeignKey("Product_Id")]
        public List<Products> Products { get; set; }
        public int Sub_Total { get; set; }
        public int Product_Quantity { get; set; }  
    }
    [Table("Product_Detail")]
    public class Products
    {
      [Key, Column(Order = 0)]
        public int Product_Id { get; set; }
         public string Product_Code { get; set; }
        public string Product_Name { get; set; }
        public int Unit_Price { get; set; }
      
    }

string code = (model.Cart[i]).Products[0].Product_Code;
                    var _products = (from p in db.Products where p.Product_Code ==code select p).FirstOrDefault();
                    int Product_Id = _products.Product_Id;
                    CartInfo cart = new CartInfo();
                    cart.Bill_Id = Bill_Id;
                    cart.Ship_Id = Ship_Id;
                    cart.Product_Id = Product_Id;
                    cart.Products = new List<Products>();
                    var pf = new Products();
                    //pf =(from p in db.Products where p.Product_Code == code select p).FirstOrDefault();
                    pf.Product_Code = (model.Cart[i]).Products[0].Product_Code;
                    pf.Product_Name = (model.Cart[i]).Products[0].Product_Name;
                    pf.Unit_Price = (model.Cart[i]).Products[0].Unit_Price;
                    cart.Products.Add(pf);
                    cart.Product_Quantity = (model.Cart[i]).Product_Quantity;
                    cart.Sub_Total = (model.Cart[i]).Sub_Total;
                    db.Cart_Details.Add(cart);   <big>// Getting error on this line.'Unable to cast object of type 'System.Collections.Generic.List`1</big>  
                    db.SaveChanges();