How to use SqlConnection InfoMessage - asp.net

Question

I have this method that calls a stored procedure. My problem is that it does not return a row, but it prints a message. I am trying to capture that print message into a variable. My problem is I have never ever used InfoMessage before and I checked it out online and for the life of me I can't seem to understand it. Can someone help me out or point me in the right direction?
Here is my code:
public List<showWhatClass> showWhatMethod(string deviceWhat, int tagWhat, Decimal latit, Decimal longit, int Process, string CallNext, int CallNextVar)
{
showWhatCell = new List<showWhatClass>();
try
{
using (connection = new SqlConnection(connectionString))
{
using (SqlCommand command = new SqlCommand("iosShowWhat", connection))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("#DeviceId", deviceWhat);
command.Parameters.AddWithValue("#TagId", tagWhat);
command.Parameters.AddWithValue("#Latitude", latit);
command.Parameters.AddWithValue("#Longitude", longit);
command.Parameters.AddWithValue("#Process", Process);
command.Parameters.AddWithValue("#CallNext", CallNext);
command.Parameters.AddWithValue("#CallNextVar", CallNextVar);
connection.Open();
/*SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
showWhatClass item = new showWhatClass();
item.CallNext = reader.GetValue(0).ToString();
item.CallNextVar = (int)reader.GetValue(1);
showWhatCell.Add(item);
}*/
}
}
}
finally
{
connection.Close();
}
return showWhatCell;
}
I have tried the following:
connection.Open();
connection.InfoMessage += delegate(object sender, SqlInfoMessageEventArgs e)
{
showWhatClass item = new showWhatClass();
item.CallNext += "\n" + e.Message;
showWhatCell.Add(item);
};
returns nothing.

Answer 1

You can use an output parameter to get the message from stored procedure and use it in your code.
Add output parameter in stored procedure
#name varchar(20) output
And then set value of this parameter
set #name='Mairaj Ahmad Minhas'
Now in your code when you call stored procedure add another parameter like this
command.Parameters.Add("#name", SqlDbType.VarChar, 20);
command.Parameters["#name"].Direction = ParameterDirection.Output;
And after you have called the stored procedure do this to get value from this parameter.
string name = command.Parameters["#name"].Value.ToString();