Strange result return from sql server

I am working on my project and having strange result with asp.net C# and stored procedure that returns scalar variable. In short, I am trying to return user name, however I get only the first letter from the name, which is strange.

I went trough the code couple dozen of times; however i still cannot find the error. I would really appreciate if somebody can find the mystake

Here is my stored procedure:

set ANSI_NULLS ON
GO
set QUOTED_IDENTIFIER ON
go

ALTER PROCEDURE [one_two].[team5GetLostPassword]
(
    @user_password varchar(50),
    @email varchar(50),
    @user_name varchar(50) out,
    @user_exist int out
)
AS
BEGIN
    declare @user_fname varchar(50);
    declare @user_lname varchar(50);
    declare @user_id int;

    set @user_exist = 0;
    SET NOCOUNT ON;

    IF EXISTS(select user_email from team5_user_detail where user_email LIKE @email)
    begin
        set @user_id = (select userid from team5_user_detail where user_email Like @email);
        update team5_user Set user_password = @user_password where userid = @user_id;
        set @user_name = (select user_lname from team5_user_detail where userid = @user_id);
        set @user_exist = 1;
    end
END

and my C# code

protected bool IsValidUser()
{
    myConn = new SqlConnection(myConStr);
    myCommand = new System.Data.SqlClient.SqlCommand("team5GetLostPassword", myConn);
    myCommand.CommandType = CommandType.StoredProcedure;
    myCommand.Parameters.AddWithValue("@user_password", userPasswordEncrypted);
    myCommand.Parameters.AddWithValue("@email", userEmailString);

    myCommand.Parameters.AddWithValue("@user_name", "").Direction = ParameterDirection.Output;
    myCommand.Parameters.AddWithValue("@user_exist", 0).Direction = ParameterDirection.Output;

    try
    {
        myConn.Open();
        myCommand.ExecuteScalar();
        userExist = myCommand.Parameters["@user_exist"].Value.ToString();
        userName = myCommand.Parameters["@user_name"].Value.ToString();
    }
    catch (Exception exep)
    {
    }
    finally
    {
        myConn.Close();
    }

    if (userExist.Contains("1"))
        return true;
    else
        return false;
}