检查 c# 中 DataSet 中的变量值是否为 NULL

Question

I am trying to iterate through a DataSet to check if the variable Mp.TheObjectPropertyNameMatr of MasterPage has returned NULL values.

When the variable Mp.TheObjectPropertyNameMatr of MasterPage has returned NULL values, I need redirect this aspx page to default aspx page.

But If add on DataSet this code:

private DataSet RetrieveProducts()
{
    if (!String.IsNullOrEmpty(Mp.TheObjectPropertyNameMatr))
    {
        DataTable dt = new DataTable();
        DataSet ds = new DataSet(); 
        ....... 
        return ds;
    }
    else
    {
        return null;
        Response.Redirect("Default.aspx");     
    }
}

I Have this error:

No executable code

On this line code:

Response.Redirect("Default.aspx");  

Please can you help me?

Answer 1

You are getting error "No executable code" because you are returning null before Response.Redirect("Default.aspx"); line.

In your case, Code written after return statement is not reachable.

From MSDN :

The return statement terminates execution of the method in which it appears and returns control to the calling method.