Declare new sqldatareader c

Here is the declaration of a new SqlDataReader object in C#:

SqlDataReader c = null;

Note that I've initialized the object to null, as it's a good practice to do so to avoid potential null reference exceptions.

Alternatively, you can also use the using statement to declare and dispose the SqlDataReader object:

using (SqlDataReader c = new SqlDataReader())
{
    // use the reader here
}

This way, the SqlDataReader object will be automatically disposed when you're done using it, which is a good practice to follow.