Hi again,
trying to learn MySql Provider.at my first sample attempt.ı wanted to use ProfileProvider for MySql and ı thought my ProfileCommon class written for SQL Server should work for MySql Provider too.But t didnt and dont know why.

ProfileCommon Profile = ProfileCommon.GetUserProfile("User1");    this line raises error
Unable to cast object of type 'System.Web.Profile.DefaultProfile' to type 'WebApplication1.ProfileCommon'.

this is my web.config :

......
  <system.web>
    <authentication mode="Forms" />
    <compilation debug="true" targetFramework="4.0" />
    <membership defaultProvider="MySQLMembershipProvider">
      <providers>
        <clear/>
        <add name="MySQLMembershipProvider" autogenerateschema="true" type="MySql.Web.Security.MySQLMembershipProvider, MySql.Web, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" connectionStringName="ConnectionString1" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" applicationName="/" requiresUniqueEmail="false" passwordFormat="Clear" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression="" />
      </providers>
    </membership>
    <profile defaultProvider="MySQLProfileProvider">
      <providers>
        <clear/>
        <add name="MySQLProfileProvider" type="MySql.Web.Profile.MySQLProfileProvider, MySql.Web, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" connectionStringName="ConnectionString1" applicationName="/" />
      </providers>
    </profile>
    <roleManager enabled="true" defaultProvider="MySQLRoleProvider">
      <providers>
        <clear/>
        <add name="MySQLRoleProvider" type="MySql.Web.Security.MySQLRoleProvider, MySql.Web, Version=6.5.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" connectionStringName="ConnectionString1" applicationName="/" />
      </providers>
    </roleManager>

  </system.web>
</configuration>

and this is my ProfileCommon Class :

namespace WebApplication1
{
    public class ProfileCommon : ProfileBase
    {
        public static ProfileCommon GetProfile()
        {
            return Create(HttpContext.Current.Request.IsAuthenticated ?
                   HttpContext.Current.User.Identity.Name : HttpContext.Current.Request.AnonymousID,
                   HttpContext.Current.Request.IsAuthenticated) as ProfileCommon;
        }

        public static ProfileCommon GetUserProfile(string username)
        {
            return (ProfileCommon)Create(username);
        }

        public static ProfileCommon GetUserProfile()
        {
            return Create(Membership.GetUser().UserName) as ProfileCommon;
        }

        [CustomProviderData("FirstName;nvarchar")]
        public virtual string FirstName
        {
            get
            {
                return ((string)(this.GetPropertyValue("FirstName")));
            }
            set
            {
                this.SetPropertyValue("FirstName", value);
            }
        }

        [CustomProviderData("LastName;nvarchar")]
        public virtual string LastName
        {
            get
            {
                return ((string)(this.GetPropertyValue("LastName")));
            }
            set
            {
                this.SetPropertyValue("LastName", value);
            }
        }
    }

}