ExecuteNonQuery requires an open and available Connection. The connection's current state is closed

Question

ExecuteNonQuery requires an open and available Connection. The connection\'s current state is closed.

What am I doing wrong here? I\'m assuming you can

Answer 1

Right here, your SqlDataReader will close the connection when it completes:

// Set all to 0 
using (SqlCommand cmd = new SqlCommand("SELECT ID FROM tblSiteSettings WHERE ID = " + revertingID, cn)) 
{ 
    // If it exists 
    SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); 
    if (rdr.Read()) 
    { 
        rowsReturned = true; 
    } 
    rdr.Close(); 
} 

Later, the "Set new active and reset others" section will fail, because the connection is closed.