Thanks, so much, I never did casting with forms before.


wrote in message
news:17590@forums.infragistics.com...
> MainForm
>
> foreach (Form frm in this.MdiChildren)
>
> {
>
> if (frm is frm_MF_Sales)
>
> {
>
> frm.Activate();
>
> ((frm_MF_Sales)this.MdiParent).RefreshSalesGrid();
>
> }
>
>
>
> You are going through Form1's MDIChildren (so the forms opened by "this"
> which if I read this correctly is the MDIContainer), and then you are
> trying to cast the this.MDIParent (which if you are on the MDIContainer
> form, would be null) into your sales form
>
> foreach (Form frm in this.MdiChildren)
>
> {
>
> if (frm is frm_MF_Sales)
>
> {
>
> frm.Activate();
>
> ((frm_MF_Sales)frm).RefreshSalesGrid();
>
> }
>

Here is my code: and I get the following error:

An exception of type 'System.NullReferenceException' occurred in Market
Forecaster.exe but was not handled in user code
Additional information: Object reference not set to an instance of an
object.

It occurs at this line of main form:
((frm_MF_Sales)this.MdiParent).RefreshSalesGrid(); I tried casting like
this as well: ((frm_MF_Sales)this.MdiChildren).RefreshSalesGrid();


MainForm

#region RefreshSalesGrid

public void RefreshSalesGridOnSalesForm()

{

foreach (Form frm in this.MdiChildren)

{

if (frm is frm_MF_Sales)

{

frm.Activate();

((frm_MF_Sales)this.MdiParent).RefreshSalesGrid();

}

}

}

#endregion





FormNeedsToBeUpdated
public void RefreshSalesGrid()

{

DataTable dtUpdated = new
DataAccess().GetDataForGrid("Sales_Pivot");

//Merge changes

salesDataTable.Merge(dtUpdated, false);



// Refresh grid, this does not redraw grid

dtUpdated.Dispose();

}



FormWhichToUpdateOtherForm
//Refresh Sales Grid

((frmMain)this.MdiParent).RefreshSalesGridOnSalesForm();



wrote in message
news:17501@forums.infragistics.com...
> Your MDI Parent would need to act as a pass through. What you are
> describing seems to be that you don't have any direct or indirect access
> to the sibling form, which is why you can only see it as a static because
> that does not require an instance.
>
>
>
> You would need to do something like this:
>
> On the MDIParent expose a method called RefreshGridOnFormType3() (or some
> other long and tedious name). The body of the method would look something
> like
>
> public void RefreshGridOnFormType3()
>
>
> {
>
> // psudo code
>
> foreach (Form f in this.MdiChildren)
>
> if (f is Form3)
>
> f.RefreshGrid() // need to cast this to a Form3 object
>
> }
>
>
>
> From your form 2, whenever you update a cell you would call the refresh
> method on the MdiParent
>
> {
>
> Form1 parentForm = (Form1) this.MdiParent;
>
> parentForm.RefreshGridOnFormType3()
>
> }
>
>
>
> And form 3 would have a public method call RefreshGrid that would do
> whatever logic you want to do.
>
>
>
> There are a few other variations on the theme, but that is the general
> idea.
>

I implemented this, but I am getting an error where you said I need to Cast
as form3, how do I cast a method call as form3?


wrote in message
news:17501@forums.infragistics.com...
> Your MDI Parent would need to act as a pass through. What you are
> describing seems to be that you don't have any direct or indirect access
> to the sibling form, which is why you can only see it as a static because
> that does not require an instance.
>
>
>
> You would need to do something like this:
>
> On the MDIParent expose a method called RefreshGridOnFormType3() (or some
> other long and tedious name). The body of the method would look something
> like
>
> public void RefreshGridOnFormType3()
>
>
> {
>
> // psudo code
>
> foreach (Form f in this.MdiChildren)
>
> if (f is Form3)
>
> f.RefreshGrid() // need to cast this to a Form3 object
>
> }
>
>
>
> From your form 2, whenever you update a cell you would call the refresh
> method on the MdiParent
>
> {
>
> Form1 parentForm = (Form1) this.MdiParent;
>
> parentForm.RefreshGridOnFormType3()
>
> }
>
>
>
> And form 3 would have a public method call RefreshGrid that would do
> whatever logic you want to do.
>
>
>
> There are a few other variations on the theme, but that is the general
> idea.
>

Thanks so much, I thought that was the way to go.


wrote in message
news:17501@forums.infragistics.com...
> Your MDI Parent would need to act as a pass through. What you are
> describing seems to be that you don't have any direct or indirect access
> to the sibling form, which is why you can only see it as a static because
> that does not require an instance.
>
>
>
> You would need to do something like this:
>
> On the MDIParent expose a method called RefreshGridOnFormType3() (or some
> other long and tedious name). The body of the method would look something
> like
>
> public void RefreshGridOnFormType3()
>
>
> {
>
> // psudo code
>
> foreach (Form f in this.MdiChildren)
>
> if (f is Form3)
>
> f.RefreshGrid() // need to cast this to a Form3 object
>
> }
>
>
>
> From your form 2, whenever you update a cell you would call the refresh
> method on the MdiParent
>
> {
>
> Form1 parentForm = (Form1) this.MdiParent;
>
> parentForm.RefreshGridOnFormType3()
>
> }
>
>
>
> And form 3 would have a public method call RefreshGrid that would do
> whatever logic you want to do.
>
>
>
> There are a few other variations on the theme, but that is the general
> idea.
>