how to store columns values in array in asp.net - mysql

Question

I am writing code in asp.net. I have a column named c_name in database. I want to store all my columns values in an array. Here is my incomplete code. I am confused what to do here.
String str = "select c_name from contacts where user_id = " + user_id + "";
MySqlCommand cmd = new MySqlCommand(str, dbConnection);
cmd.ExecuteNonQuery();
MySqlDataReader mdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
while (mdr.Read())
{
}
Please help.

Answer 1

Check below code:
String str = "select c_name from contacts where user_id = " + user_id + "";
MySqlCommand cmd = new MySqlCommand(str, dbConnection);
MySqlDataReader mdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
List<string> list = new List<string>();
while (mdr.Read())
{
list.Add(mdr.GetString(0));
}
string[] strMyArray = list.ToArray<string>();

Answer 2

I suspect one of your your problems is this line:
cmd.ExecuteNonQuery();
You're actually executing cmd twice, once with this line and once again when you create your reader. I've also added a little code to copy the result into an element in a list. Try the following:
string str = "select c_name from contacts where user_id = " + user_id + "";
MySqlCommand cmd = new MySqlCommand(str, dbConnection);
MySqlDataReader mdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
// create a list to hold the results in
List<string> results = new List<string>();
while (mdr.Read())
{
// for each row read a string and add it in
results.Add(mdr.GetString(0));
}
You've asked for an array - I've used a list because it's easier. If you REALLY want an array then just call:
var theArray = results.ToArray();
I would also suggest throwing in some using blocks around the connection, command and reader.