System.Data.SqlClient.SqlException: Implicit conversion from data type sql_variant to uniqueidentifier is not allowed.
===

I am facing this error when i try to edit my text in the ListView and subsequently update it in the database. This error message shows when i click on the update button in my ListView. As my UserID is a uniqueIdentifier, it cannot be updated to my database. But i do not really know what changes to make in my codes.

My error message shows this:

    Implicit conversion from data type sql_variant to uniqueidentifier is not allowed. Use the CONVERT function to run this query.

My SQL Statement in .cs:

    protected void updateComment(object sender, ListViewUpdateEventArgs e)
    {
         
        MembershipUser currentUser = Membership.GetUser();
        Guid currentUserId = (Guid)currentUser.ProviderUserKey;

        var ID= ListView1.DataKeys[e.ItemIndex].Value.ToString();

        string connectionString = ConfigurationManager.ConnectionStrings["ASPNETConnectionString"].ConnectionString;
        SqlConnection myConnect = new SqlConnection(connectionString);

        string updateSql = "UPDATE Review set ContentRev =@ContentRev WHERE ID = @ID";

        using (SqlConnection myConnection = new SqlConnection(connectionString))
        {
            myConnection.Open();

            SqlCommand myCommand = new SqlCommand(updateSql, myConnection);
            myCommand.Parameters.AddWithValue("@ID", ID);
            myCommand.Parameters.AddWithValue("@ContentRev ", TextBox1.Text.Trim());

            myCommand.ExecuteNonQuery();

            myConnection.Close();

            ListView1.DataBind();
            }


My datatype for Userid is Object and ContentRev is String.
