Disabling Datasource differnet from the sender in EventHandler

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Hi everyone, i have task where i need to disable the Datasource(SalesLine) in the forum SalesTable when the SalesEditLines is open.

to do so i used an event handler like this

[FormEventHandler(formStr(SalesEditLines), FormEventType::Activated)]    public static void SalesEditLines_OnActivated(xFormRun sender, FormEventArgs e)    {        Args    args;        FormRun formRun;        Args = new Args(formStr(SalesTable));        formRun = New FormRun(Args);        FormDataSource SalesLine_ds = formRun.dataSource(formDataSourceStr(SalesTable, SalesLine ));                SalesLine_ds.allowEdit(false);    }

but i always getting /Object reference not set to an instance of an object./ for SalesLine_ds.

thank you in advance for your help.

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Layan Jwei 8,118 Super User 2025 Season 2 on at

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Hi Community User,

sender here is the SalesEditLines form -- this form doesn't contain SalesTable or SalesLine, if you debug you'll see that SalesLine_ds is null that's why when the code reaches SalesLine_ds.AllowEdit(false) you get the object reference error.
Are you sure you want to disable SalesLine?

please take a screenshot of you want to disable

Thanks,
Layan Jweihan

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Waed Ayyad 9,039 Super User 2025 Season 2 on at

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Hi @ Community User,

Try this code, as I understand you want to disable caller datasource? but if you can give us more details to help you better.

[FormEventHandler(formStr(SalesEditLines), FormEventType::Activated)]
public static void SalesEditLines_OnActivated(xFormRun sender, FormEventArgs e)
{
FormRun formRun;
formRun = sender.args().caller();
FormDataSource SalesLine_ds = formRun.dataSource(formDataSourceStr(SalesTable, SalesLine ));
SalesLine_ds.allowEdit(false);
}

Regards,

Waed Ayyad

Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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