ASPxGridview Change Default value in inline EditForm

I'm trying to change the value in an editform before it becomes visible to the user. However the aspxgridview is always overwriting this.

This is my solution:

 Protected Sub ASPxGridView_ItemList_HtmlRowCreated(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxGridView.ASPxGridViewTableRowEventArgs) Handles ASPxGridView_Items.HtmlRowCreated
        If (e.RowType = GridViewRowType.开发者_如何学CEditForm) Then
            Dim ASPxTextbox_Number As ASPxTextBox = TryCast(TryCast(sender, ASPxGridView).FindEditFormTemplateControl("ASPxTextbox_Number"), ASPxTextBox)
            ASPxTextbox_Number.Text = "99"
        End If
    End Sub

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Please refer to the How to update an ASPxGridView DataSource if the initial values are set programmatically in the HtmlRowCreated event example in this regard.