Returning a single row

Question

I\'m trying to return a single row from a database:

using (connection = new SqlConnection(ConfigurationManager.AppSettings[\"connection\"]))
{
    using (command         


        

Answer 1

the reader returns object which you should cast it to what you need, in this case a string.

you can use any of this codes :

return reader.GetString(0);

return reader["col_1"].ToString();

return Convert.ToString(reader["col_1"]);

return reader["col_1"] as string;

but dont forget to close the connection and reader before leaving the function.

string ret = reader.GetString(0);
reader.Close();
connection.Close();
return ret;

Answer 2

Follow the following steps to select a single colume, and display them.

    //create a connection
    SqlConnection sqlConnection = new SqlConnection("Your Connection String");
    SqlCommand cmd = new SqlCommand();
    cmd.Connection = sqlConnection;

    //open the connection
    sqlConnection.Open();

    //Your command query string
    cmd.CommandType = CommandType.Text;
    cmd.CommandText = "SELECT TOP 1 col_name FROM Customers";


    //Execute the reader
    SqlDataReader result  = cmd.ExecuteReader();
    result.Read();

    //close the connection
    sqlConnection.Close();

    return result["coiumn_name"].ToString(); 

Answer 3

The problem is the return type. The method you are in is expecting you to return a string, but reader["col_1"] is an object. I suggest returning reader["col_1"].ToString() or Convert.ToString(reader["col_1"]).

Answer 4

First of all you can use the cast (string)reader["col_1"]. You are probably expecting a string and reader["col_1"] is an object.