Using sqldatareader in another sqldatareader - asp.net

Question

I'm checking table to see if ID exists in table A if that ID exists insert it in table B but I also would like to check in table B if that ID number was not already inserted. But my issue is that I'm not able to combine all of that together. I'm not sure how to put a sqldatareader into another.
SqlCommand cmd1 = new SqlCommand("CreateID", con);
SqlCommand cmd = new SqlCommand("selectID", conn);
SqlCommand com = new SqlCommand("SelectIDfromtableB", con);
public SqlDataReader dr;
using (SqlDataReader reader = cmd.ExecuteReader())
{
if (reader.HasRows)
{
while (reader.Read())
{
sessionCount++;
Session["Count"] = sessionCount;
cmd1.Parameters.Add("#crate_box_no", SqlDbType.NVarChar).Value = id;
cmd1.Parameters.Add("#Username", SqlDbType.NVarChar).Value = user;
cmd1.Parameters.Add("#Date", SqlDbType.DateTime).Value = date;
}
reader.Close();
cmd1.ExecuteNonQuery();
}
else
{
Page.ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert( Id number does not exist'); window.location.href = 'Return.aspx';", true);
}
}
if (dr.Read())
{
lblError.Text = "Data was inserted before";
}
dr.Close();

Answer 1

You can minimize the code, use one connection for all the readers and one command, but you have to set the CommandText each time and clear the parameters if there were any. Use the using keyword to make sure your resources are disposed.
If there is anything you need to check in your first command, you can set a flag
using (var conn = GetTheConnection())
{
conn.Open();
//flag to check if id exists
var idExists = false;
var cmd= new SqlCommand("CreateID", conn );
cmd.Parameters.Add("#crate_box_no", SqlDbType.NVarChar).Value = id;
using (var myReader = cmd.ExecuteReader())
{
if(myReader.Read())
{
idExists = true;
}
}
//clear parameters
if (idExists)
{
cmd.Parameters.Clear();
cmd.commandText = "You 2nd SQL Script here"
using (var myReader = cmd.ExecuteReader())
{
}
}
}

Answer 2

Cant you just do 2 queries? First one counting rows of id occurences, if greater 0 then count occurences in table b, if 0 continue?
Edit Example pseudo code:
command1 = "select id from tableA where id = toLookForId";
Define GridView1 and Gridview2;
Gridview1.datasource = sqldatareader.executenonquery(command1);
Gridview1.databind();
if gridview1.rows.count > 0 then
command2 = "select id from tableB where id = toLookForId";
Gridview2.datasource = sqlreader.executenonquery(command2);
gridview2.databind();
if gridview2.rows.count = 0 then
//your code goes here
else
//id exists so quit
return;
end if
end if
Regards,
Maheshvara