C# programming issue using sql?

Question

My problem is not my stored procedure but the fact that somewhere in my code it wont allow me to change the role in the database. Although i know it is written correctly could someone please have a good look at my code as iam really frustrated atm. Thankyou in advanced..

DAO -

    public void EditRole(Account account, RoleEnum role)
    {
        using (SqlConnection connection = ConnectionDao.GetConnection())
        {
            SqlCommand cmd = new SqlCommand("sp_Accounts_EditRoleByUsername", connection);
            cmd.CommandType = System.Data.CommandType.StoredProcedure;    

            cmd.Parameters.Add(new SqlParameter("@role", role);
            cmd.Parameters.Add(new SqlParameter("@username", account.Username));              

            cmd.ExecuteNonQuery();
        }

Manager -

       public static ResultEnum RoleChange(Account account, RoleEnum role)
    {
        ResultEnum result = ResultEnum.Success;

        try
        {
            AccountDao dao = new AccountDao();
            dao.EditRole(account, role);
        }
        catch (Exception)
        {
            result = ResultEnum.Error;
        }
        return result;
    }

The page -

       public partial class ManageRolesPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Result<List<Account>> result = AccountManager.GetAll();
            if (result.ResultEnum == ResultEnum.Success)
            {
                ddlUser.DataSource = result.Data;
                ddlUser.DataTextField = "Username";
                ddlUser.DataValueField = "AccountId";
                ddlUser.DataBind();
            }
            else
            {
                lblInfo.Text = "database error";
            }
        }

    }

    protected void btnPermission_Click(object sender, EventArgs e)
    {

        Account account = new Account
        {
            Username = ddlUser.SelectedValue
        };

        RoleEnum role;

        if (rdlRole.SelectedValue == "Admin")
        {
            role = RoleEnum.Admin;

        }
        else
        {                
            role = RoleEnum.User;
        }



         ResultEnum result = AccountManager.RoleChange(account, role);

        switch (result)
        {
            case ResultEnum.Success:
                lblInfo.Text = "User: " + ddlUser.SelectedItem + " Has been edited to " + role;
                break;
            case ResultEnum.Error:
                lblInfo.Text = "Error";
                break;                
        }                      

    }

Answer 1

The problem is you are using selected value of dropdown as username

Account account = new Account
        {
            Username = ddlUser.SelectedValue
        };

where as when you are binding it with datasource, The value field is AccountId

ddlUser.DataValueField = "AccountId";

So in your function AccountId is actually passing as UserName of that user. So that makes your query with unusual result.