how to show my own error message?

[Vincent]

Hi,

There are two related tables: one called 'group' and the other 'items'. Each
item belongs to a group. The table 'group' is shown in a gridview with a
linkbutton for deleting.

When an user tries to delete a group which still contains items, he gets the
message:
"The DELETE statement conflicted with the REFERENCE constraint
"FK_items_groep 1". The conflict occurred in database "tennis", table
"dbo.mytabl e", column 'groupna'.
The statement has been terminated. "

I want to avoid this and just send a short message in a label. So i tried
this, but the error message still appears.

aspx file:
----------
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateFi eld>
<ItemTemplate >
<asp:LinkButt on ID="lb1" runat="server"
CommandArgument ="<%# Container.DataI temIndex %>"
CommandName="De lete">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateFie ld>
....

code-behind:
-----------
....
If e.CommandName = "Delete" Then
Try
Me.SqlDataSourc e1.DeleteComman d = "delete from groep WHERE groepnr='" &
groupkey & "'"
Catch ex As Exception
label1.Text = "Group '" & Server.HtmlEnco de(groupkey) & "' cannot be
removed."
End Try
End If
Thanks
Vincent

T.

[Eliyahu Goldin]

You need to try-catch the databind operation. With the declarative
databinding it is a bit tricky. It will be simpler just to use regular
databinding, with the DataSource property rather that with the DataSourceID:

GridView1.DataS ource = SqlDataSource1
try
GridView1.DataB ind()
catch
....
--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"Vincent" <vi,@sd.cvwro te in message
news:eu******** ******@TK2MSFTN GP04.phx.gbl...

Hi,

There are two related tables: one called 'group' and the other 'items'.
Each item belongs to a group. The table 'group' is shown in a gridview
with a linkbutton for deleting.

When an user tries to delete a group which still contains items, he gets
the message:
"The DELETE statement conflicted with the REFERENCE constraint
"FK_items_groep 1". The conflict occurred in database "tennis", table
"dbo.mytabl e", column 'groupna'.
The statement has been terminated. "

I want to avoid this and just send a short message in a label. So i tried
this, but the error message still appears.

aspx file:
----------
<asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:TemplateFi eld>
<ItemTemplate >
<asp:LinkButt on ID="lb1" runat="server"
CommandArgument ="<%# Container.DataI temIndex %>"
CommandName="De lete">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateFie ld>
...

code-behind:
-----------
...
If e.CommandName = "Delete" Then
Try
Me.SqlDataSourc e1.DeleteComman d = "delete from groep WHERE groepnr='" &
groupkey & "'"
Catch ex As Exception
label1.Text = "Group '" & Server.HtmlEnco de(groupkey) & "' cannot be
removed."
End Try
End If
Thanks
Vincent

T.

[Vincent]

Thanks
"Eliyahu Goldin" <RE************ **************@ mMvVpPsS.orgsch reef in
bericht news:eD******** ******@TK2MSFTN GP02.phx.gbl...

You need to try-catch the databind operation. With the declarative
databinding it is a bit tricky. It will be simpler just to use regular
databinding, with the DataSource property rather that with the
DataSourceID:

GridView1.DataS ource = SqlDataSource1
try
GridView1.DataB ind()
catch
...
--
Eliyahu Goldin,
Software Developer
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"Vincent" <vi,@sd.cvwro te in message
news:eu******** ******@TK2MSFTN GP04.phx.gbl...

>Hi,

There are two related tables: one called 'group' and the other 'items'.
Each item belongs to a group. The table 'group' is shown in a gridview
with a linkbutton for deleting.

When an user tries to delete a group which still contains items, he gets
the message:
"The DELETE statement conflicted with the REFERENCE constraint
"FK_items_groe p1". The conflict occurred in database "tennis", table
"dbo.mytable ", column 'groupna'.
The statement has been terminated. "

I want to avoid this and just send a short message in a label. So i tried
this, but the error message still appears.

aspx file:
----------
<asp:GridVie w ID="GridView1" runat="server">
<Columns>
<asp:TemplateFi eld>
<ItemTemplate >
<asp:LinkButt on ID="lb1" runat="server"
CommandArgument ="<%# Container.DataI temIndex %>"
CommandName="De lete">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateFie ld>
...

code-behind:
-----------
...
If e.CommandName = "Delete" Then
Try
Me.SqlDataSourc e1.DeleteComman d = "delete from groep WHERE groepnr='" &
groupkey & "'"
Catch ex As Exception
label1.Text = "Group '" & Server.HtmlEnco de(groupkey) & "' cannot be
removed."
End Try
End If
Thanks
Vincent

T.