I'm having such a problem with this DropDownList in a user control that is
posting back and throwing an error: System.Web.Http Exception: A
DropDownList cannot have multiple items selected
<ASP:DROPDOWNLI ST ID="lbCountries Wiz" ENABLEVIEWSTATE ="true" FONT-SIZE="8pt"
ONSELECTEDINDEX CHANGED="ddlQue ryProvinces"
AUTOPOSTBACK="T rue" RUNAT="server" WIDTH="150px"></ASP:DROPDOWNLIS T>
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
'Put user code to initialize the page here
If Not Page.IsPostBack Then
Dim tempItem3 As New System.Web.UI.W ebControls.List Item
tempItem3.Text = "Chad"
tempItem3.Value = "TD"
tempItem3.Selec ted = False
Me.lbCountriesW iz.Items.Insert (0, tempItem3)
Dim tempItem2 As New System.Web.UI.W ebControls.List Item
tempItem2.Text = "Bosnia and Herzegovina"
tempItem2.Value = "BA"
tempItem2.Selec ted = False
Me.lbCountriesW iz.Items.Insert (0, tempItem2)
Dim tempItem As New System.Web.UI.W ebControls.List Item
tempItem.Text = "|--None Selected"
tempItem.Value = "0"
tempItem.Select ed = False
lbCountriesWiz. Items.Insert(0, tempItem)
End If
End Sub
When a button in the same user control is pushed and then I reselect the
DropDownList, I don't get the error.
<ASP:BUTTON ID="btnAllCommu nities"
ONCLICK="btnPop ulateAllCommuni ties_OnClick" FONT-SIZE="8"
RUNAT="server" TEXT="All Communities" BORDERSTYLE="in set"></ASP:BUTTON>
Public Sub btnPopulateAllC ommunities_OnCl ick(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles btnAllCommuniti es.Click
'These simply fill some other listboxes
GetProvinces()
GetDistricts()
GetSubDistricts ()
GetCommunities( )
End Sub
When buttons (such as below) in the controling Page are pushed and then I
try to reselect the DropDownList, I get the error.
<ASP:BUTTON id="btn1" onclick="GetRep ort1_OnClick" RUNAT="server" TEXT="Get
report of" HEIGHT="20"
FONT-SIZE="10px"></ASP:BUTTON>
Sub GetReport1_OnCl ick(ByVal Sender As Object, ByVal e As System.EventArg s)
Try
dgSHA.Visible = False
dgShasSum.Visib le = False
dgCommunity.Vis ible = True
dgCommunitiesSu m.Visible = True
ShowButtons()
'pnlCommunities Buttons.Visible = True
Dim _sqlStmtR1 As String
_sqlStmtR1 = "SELECT * FROM vwCommunities WHERE countryID = '" &
CType(Page,
_default1).choo seAdminUnitsWiz 1.lbCountriesWi z.SelectedItem. Value & "' "
If ddlImpactLevel1 .SelectedItem.V alue <> "All" Then
_sqlStmtR1 = _sqlStmtR1 & " AND Impact = '" &
ddlImpactLevel1 .SelectedItem.V alue & "'"
End If
'_sqlStmtR1 = _sqlStmtR1 & " ORDER BY Community"
Dim myDataSetCommun ities1 As New DataSet
Dim myDataAdapterCo mmunities1 As New SqlDataAdapter( _sqlStmtR1,
connection1.con String)
myDataAdapterCo mmunities1.Fill (myDataSetCommu nities1,
"CommunitiesTmp 1")
dgCommunity.Dat aSource =
myDataSetCommun ities1.Tables(" CommunitiesTmp1 ")
dgCommunity.Dat aBind()
CommunitiesWizS qlSumStatement( 1)
Dim myDataSetCommun itiesSum As New DataSet
Dim myDataAdapterCo mmunitiesSum As New
SqlDataAdapter( _sqlStmtLbCommu nitiesWizSum, connection1.con String)
myDataAdapterCo mmunitiesSum.Fi ll(myDataSetCom munitiesSum,
"CommunitiesSum Tmp1")
dgCommunitiesSu m.DataSource =
myDataSetCommun itiesSum.Tables ("CommunitiesSu mTmp1")
dgCommunitiesSu m.DataBind()
RecordCount2.Te xt = ""
RecordCount3.Te xt = ""
RecordCount4.Te xt = ""
RecordCount5.Te xt = ""
RecordCount6.Te xt = ""
Dim RcdCount As Integer
Dim ResultCount As Integer
RcdCount =
myDataSetCommun ities1.Tables(" CommunitiesTmp1 ").Rows.Count.T oString()
ResultCount = RcdCount
RecordCount1.Te xt = RcdCount & " records"
RecordCountBott om.Text = RcdCount & " records"
Session("savedD ataGridSql") = _sqlStmtR1
Session("dgType ") = "Community"
Me.sortCriteria = "Community"
Me.sortDir = "ASC"
If Session("dgType ") = "Community" Then
pnlCommunitiesB uttons.Visible = True
pnlShasButtons. Visible = False
Else
pnlCommunitiesB uttons.Visible = False
pnlShasButtons. Visible = True
End If
Catch ex As Exception
ExceptionManage r.Publish(ex)
End Try
End Sub
