如何在devexpress gridview中更改列的值？

Question

您好我想在gridview中更改TankLevel1列的值或文本。

如果TankLevel1等于0我想在TankLevel1列上显示“Tank 1 is offline”。

我试过这样的 TankLevel1在SQL

中是整数

<dx:GridViewDataProgressBarColumn  
    Settings-AllowAutoFilter=False Settings-AllowGroup=False Settings-AllowSort=False  FieldName="TankLevel1" Caption="Tank Level 1">

    <PropertiesProgressBar Width="" Height=""/>
    <Settings AllowAutoFilter="False" AllowSort="False" AllowGroup="False"/>
</dx:GridViewDataProgressBarColumn>

protected void myGrid_CustomColumnDisplayText(object sender, ASPxGridViewColumnDisplayTextEventArgs e)
{
    if (e.Column.FieldName == "TankLevel1 ") return;
    if (e.Value.Equals(50))
    {
        e.DisplayText = "Tank 1 is offline";
    }
}