Dropindex is not working

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C#3.5

entity-framework

Hi All,

in my application i use code first.When its create a database at first time, its create the UserNameIndex against the User table (I'm using Identity here). If i want delete that index, i just add-migration and on the Down method i add the following code.

public override void Down()
{
DropIndex("dbo.Users", new[] { "UserNameIndex" });
}

After i update-database, its doesn't update the user table anymore, please help me to solve it.

Thanks

What I have tried:

1. Add-migration InitialCreate, its create following class

public partial class InitialCreate : DbMigration
{
public override void Up()
{
}

public override void Down()
{
DropIndex("dbo.Users", new[] { "UserNameIndex" });
}
}

2. Update-database