My dropDownList always in insert take the fisrt value

Question

My dropDownList Always take the first value when I change the value,insert the first this my code

 

public partial class AddUsers : System.Web.UI.Page

{

UsersLogique users = new UsersLogique();

RolesLogique Roles = new RolesLogique();

protected void Page_Load(object sender, EventArgs e)

{

if (Session["Users"] == null)

{

Response.Redirect("Authentication.aspx");

}

else

{

BindRoleList();

}

}

private void Insert()

{

try

{

var UEmail = Email.Text.ToString().Trim();

var UPassword = Password.Text.ToString().Trim();

var UFirstName = FirstName.Text.ToString().Trim();

var ULastName = LastName.Text.ToString().Trim();

var UIsDelete = 0;

var UCreation = DateTime.Now.ToString().Trim();

var UCreatedBy = Convert.ToInt32(Session["Users"]);

var URole = role.SelectedValue;

var User = new DataAccessLayer.Models.USER

{

UsersEmail = UEmail,

UsersPassword = UPassword,

UsersFirstName = UFirstName,

UsersLastName = ULastName,

IsDelete = Convert.ToBoolean(UIsDelete),

DateCreation = Convert.ToDateTime(UCreation),

IdRoles= Convert.ToInt32(URole),

CreatedBy = UCreatedBy,

};

users.CreateNewUser(User);

Response.Redirect("Users.aspx");

}

catch (Exception)

{

throw;

}

}

private void BindRoleList()

{

var roles = Roles.RolesList().ToList();

role.DataSource = roles.Select(a => new { a.RolesId, a.RolesName });

role.DataValueField = "RolesId";

role.DataTextField = "RolesName";

role.DataBind();

}

protected void Button2_Click(object sender, EventArgs e)

{

Insert();

}

}

}