MBR IT/.NET 247 : Dropdownlist Rendering error PLEASE HELP on ASPFriends.com 'aspngdatagridrepeaterdatalist' list

Dropdownlist Rendering error PLEASE HELP

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This message was discovered on ASPFriends.com 'aspngdatagridrepeaterdatalist' list.

Wolfgang Baeck

Hi,

This seems to be too simple, but I have a real problem with it. The
rendering of the webpage complains with:

A DropDownList cannot have multiple items selected

and I have only one item selected!

I have many other pages with DDLs that are working and I just created
another one and I get the same error there too. Darn it, I know how to use
DDL's, what is going on?

I have a webpage where I have the ability to select an item from a grid, and
then, in the postback, I display the details for that item for edit. One of
the widgets is a dropdownlist. Whenever I select an Item in the grid that
causes a different item to be selected than which was previously selected in
the dropdownlist, I get the error:

A DropDownList cannot have multiple items selected

I only select one item , albeit a different one than that which was selected
before. The code behind section that selects the item gives no error, only
the rendering Do I have to clear the selection of the list first? If so,
how and why only on this page?

Here is the section:

private void user_Select(object
sender,System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string user = e.CommandArgument.ToString();
HopeAndHome.Components.User aUser = new
HopeAndHome.Components.User();
aUser.sUser = user;
DataTable aUserTable = aUser.Select();
if (aUserTable.Rows.Count > 0)
{
lblUser.Text = user;
btnRemoveUser.Visible = true;
btnUpdate.Visible = true;
btnDeleteLog.Visible = true;
DataRow myRow = aUserTable.Rows[0];
int id =
(int)myRow["Person_LegalEntity_Id"];
lblLegalEntityId.Text = id.ToString();
UserLog1.iLegalEntityId = id;
UserLog1.Visible = true;
txtUser.Text = (string)myRow["User"];
txtPassword.Text =
(string)myRow["Password"];
txtFullName.Text = (string)myRow["LastName"]
+ ", " + (string)myRow["FirstName"];

ddlRole.Items.FindByValue((string)myRow["Role"]).Selected = true;
}
}

Reply to this message...

Ben Miller

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Reply to this message...

Wolfgang Baeck

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[aspngdatagridrepeaterdatalist] Dropdownlist Rendering error PLEASE =
HELPHi Ben,

Thanks for even thinking about it. I have this posted now 4 times and no =
success.

It didn't work. I'm also not sure how this would result in a previous =
selection being "undone" and why my original solution works in some =
cases.

Wolfgang
-----Original Message-----
From: Ben Miller [mailto:Click here to reveal e-mail address]
Sent: Tuesday, July 23, 2002 3:25 PM
To: aspngDataGridRepeaterDatalist
Subject: RE: [aspngdatagridrepeaterdatalist] Dropdownlist Rendering =
error PLEASE HELP

Your problem could be that instead of setting the SelectedIndex of the =
DDL, you are trying to make the Selected property True.

So I would suggest instead of doing it the way you are, to change it =
around and use the SelectedIndex property.

ddlRole.Items.FindByValue((string)myRow["Role"]).Selected =3D true;

Instead:

ListItem objItem =3D ddlRole.Items.FindByValue((string)myRow["Role"]);
ddlRole.SelectedIndex =3D ddlRole.Items.IndexOf(objItem);

Ben.
-----Original Message-----=20
From: Wolfgang Baeck [mailto:Click here to reveal e-mail address]=20
Sent: Tue 7/23/2002 10:26 AM=20
To: aspngDataGridRepeaterDatalist=20
Cc:=20
Subject: [aspngdatagridrepeaterdatalist] Dropdownlist Rendering =
error PLEASE HELP

Hi,

This seems to be too simple, but I have a real problem with it. The
rendering of the webpage complains with:

A DropDownList cannot have multiple items selected

and I have only one item selected!

I have many other pages with DDLs that are working and I just =
created
another one and I get the same error there too. Darn it, I know how =
to use
DDL's, what is going on?

I have a webpage where I have the ability to select an item from a =
grid, and
then, in the postback, I display the details for that item for edit. =
One of
the widgets is a dropdownlist. Whenever I select an Item in the grid =
that
causes a different item to be selected than which was previously =
selected in
the dropdownlist, I get the error:

A DropDownList cannot have multiple items selected

I only select one item , albeit a different one than that which was =
selected
before. The code behind section that selects the item gives no =
error, only
the rendering Do I have to clear the selection of the list first? If =
so,
how and why only on this page?

Here is the section:

private void user_Select(object
sender,System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string user =3D =
e.CommandArgument.ToString();
HopeAndHome.Components.User aUser =3D new
HopeAndHome.Components.User();
aUser.sUser =3D user;
DataTable aUserTable =3D aUser.Select();
if (aUserTable.Rows.Count > 0)
{
lblUser.Text =3D user;
btnRemoveUser.Visible =3D true;
btnUpdate.Visible =3D true;
btnDeleteLog.Visible =3D true;
DataRow myRow =3D =
aUserTable.Rows[0];
int id =3D
(int)myRow["Person_LegalEntity_Id"];
lblLegalEntityId.Text =3D =
id.ToString();
UserLog1.iLegalEntityId =3D id;
UserLog1.Visible =3D true;
txtUser.Text =3D =
(string)myRow["User"];
txtPassword.Text =3D
(string)myRow["Password"];
txtFullName.Text =3D =
(string)myRow["LastName"]
+ ", " + (string)myRow["FirstName"];

ddlRole.Items.FindByValue((string)myRow["Role"]).Selected =3D true;
}
}

| [aspngdatagridrepeaterdatalist] member Click here to reveal e-mail address =3D =
YOUR ID
| =
http://www.aspfriends.com/aspfriends/aspngdatagridrepeaterdatalist.asp =
=3D JOIN/QUIT

------=_NextPart_001_000F_01C23276.79B06BD0
Content-Type: text/html;
    charset="utf-8"
Content-Transfer-Encoding: quoted-printable

=EF=BB=BF<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>[aspngdatagridrepeaterdatalist] Dropdownlist =
Rendering error PLEASE HELP</TITLE>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8">
<META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR></HEAD>
<BODY dir=3Dltr>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =
size=3D2>Hi=20
Ben,</FONT></SPAN></DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =
size=3D2>Thanks=20
for even thinking about it. I have this posted now 4 times and no=20
success.</FONT></SPAN></DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =
size=3D2>It=20
didn't work. I'm also not sure how this would result in a previous =
selection=20
being "undone" and why my original solution works in some=20
cases.</FONT></SPAN></DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D542042000-24072002><FONT face=3DArial color=3D#0000ff =

size=3D2>Wolfgang</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> Ben Miller=20
[mailto:Click here to reveal e-mail address]<BR><B>Sent:</B> Tuesday, July 23, 2002 =
3:25=20
PM<BR><B>To:</B> aspngDataGridRepeaterDatalist<BR><B>Subject:</B> RE:=20
[aspngdatagridrepeaterdatalist] Dropdownlist Rendering error PLEASE=20
HELP<BR><BR></FONT></DIV>
<DIV>Your problem could be that instead of setting the SelectedIndex =
of the=20
DDL, you are trying to make the Selected property True.</DIV>
<DIV> </DIV>
<DIV>So I would suggest instead of doing it the way you are, to change =
it=20
around and use the SelectedIndex property.</DIV>
<DIV> </DIV>
<DIV><FONT =
size=3D2>ddlRole.Items.FindByValue((string)myRow["Role"]).Selected =3D=20
true;</FONT><BR></DIV>
<DIV>Instead:</DIV>
<DIV> </DIV>
<DIV>ListItem objItem =3D=20
ddlRole.Items.FindByValue((string)myRow["Role"]);</DIV>
<DIV>ddlRole.SelectedIndex =3D ddlRole.Items.IndexOf(objItem);</DIV>
<DIV> </DIV>
<DIV>Ben.</DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV><FONT size=3D2>-----Original Message----- <BR><B>From:</B> =
Wolfgang Baeck=20
[mailto:Click here to reveal e-mail address] <BR><B>Sent:</B> Tue 7/23/2002 10:26 =
AM=20
<BR><B>To:</B> aspngDataGridRepeaterDatalist <BR><B>Cc:</B>=20
<BR><B>Subject:</B> [aspngdatagridrepeaterdatalist] Dropdownlist =
Rendering=20
error PLEASE HELP<BR><BR></FONT></DIV>
<P><FONT size=3D2>Hi,<BR><BR>This seems to be too simple, but I have =
a real=20
problem with it. The<BR>rendering of the webpage complains =
with:<BR><BR>A=20
DropDownList cannot have multiple items selected<BR><BR>and I have =
only one=20
item selected!<BR><BR>I have many other pages with DDLs that are =
working and=20
I just created<BR>another one and I get the same error there too. =
Darn it, I=20
know how to use<BR>DDL's, what is going on?<BR><BR>I have a webpage =
where I=20
have the ability to select an item from a grid, and<BR>then, in the=20
postback, I display the details for that item for edit. One =
of<BR>the=20
widgets is a dropdownlist. Whenever I select an Item in the grid=20
that<BR>causes a different item to be selected than which was =
previously=20
selected in<BR>the dropdownlist, I get the error:<BR><BR>A =
DropDownList=20
cannot have multiple items selected<BR><BR>I only select one item , =
albeit a=20
different one than that which was selected<BR>before. The code =
behind=20
section that selects the item gives no error, only<BR>the rendering =
Do I=20
have to clear the selection of the list first? If so,<BR>how and why =
only on=20
this page?<BR><BR>Here is the=20
=
section:<BR><BR>         &nb=
sp;     =20
private void=20
=
user_Select(object<BR>sender,System.Web.UI.WebControls.DataGridCommandEve=
ntArgs=20
=
e)<BR>           &=
nbsp;   =20
=
{<BR>           &n=
bsp;           =20
string user =3D=20
=
e.CommandArgument.ToString();<BR>      &nbs=
p;            =
;    =20
HopeAndHome.Components.User aUser =3D=20
=
new<BR>HopeAndHome.Components.User();<BR>     &n=
bsp;           &nb=
sp;     =20
aUser.sUser =3D=20
=
user;<BR>          &nbs=
p;            =
;=20
DataTable aUserTable =3D=20
=
aUser.Select();<BR>         =
            &=
nbsp; =20
if (aUserTable.Rows.Count >=20
=
0)<BR>           &=
nbsp;           =20
=
{<BR>           &n=
bsp;           &nb=
sp;       =20
lblUser.Text =3D=20
=
user;<BR>          &nbs=
p;            =
;        =20
btnRemoveUser.Visible =3D=20
=
true;<BR>          &nbs=
p;            =
;        =20
btnUpdate.Visible =3D=20
=
true;<BR>          &nbs=
p;            =
;        =20
btnDeleteLog.Visible =3D=20
=
true;<BR>          &nbs=
p;            =
;        =20
DataRow myRow =3D=20
=
aUserTable.Rows[0];<BR>        &n=
bsp;           &nb=
sp;          =20
int id=20
=
=3D<BR>(int)myRow["Person_LegalEntity_Id"];<BR>    &n=
bsp;           &nb=
sp;           &nbs=
p;  =20
lblLegalEntityId.Text =3D=20
=
id.ToString();<BR>         &=
nbsp;           &n=
bsp;         =20
UserLog1.iLegalEntityId =3D=20
=
id;<BR>           =
            &=
nbsp;       =20
UserLog1.Visible =3D=20
=
true;<BR>          &nbs=
p;            =
;        =20
txtUser.Text =3D=20
=
(string)myRow["User"];<BR>        =
;            =
           =20
txtPassword.Text=20
=
=3D<BR>(string)myRow["Password"];<BR>      =
            &=
nbsp;           &n=
bsp;=20
txtFullName.Text =3D (string)myRow["LastName"]<BR>+ ", " +=20
=
(string)myRow["FirstName"];<BR><BR>ddlRole.Items.FindByValue((string)myRo=
w["Role"]).Selected=20
=3D=20
=
true;<BR>          &nbs=
p;            =
;=20
=
}<BR>           &n=
bsp;   =20
}<BR><BR><BR>| [aspngdatagridrepeaterdatalist] member =
Click here to reveal e-mail address =3D=20
YOUR ID<BR>| <A=20
=
href=3D"http://www.aspfriends.com/aspfriends/aspngdatagridrepeaterdatalis=
t.asp">http://www.aspfriends.com/aspfriends/aspngdatagridrepeaterdatalist=
.asp</A>=20
=3D JOIN/QUIT<BR></FONT></P></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

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Hidayath Aman

Do a ClearSelection() , before using the set it will fix the problem
(Type your message here)

--------------------------------
From: Hidayath Aman

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	System.Data.DataRow
	System.Data.DataTable
	System.Web.UI.WebControls.DataGridCommandEventArgs
	System.Web.UI.WebControls.DropDownList
	System.Web.UI.WebControls.ListItem

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