BC30311: Value of type 'Control' cannot be converted to 'System.Web.UI.WebControls.CheckBox'
Hi, can somebody help me on this problem. It works at first, but all of a sudden, it fails, and I can't find out why.
1 Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) 2 3 If Not CheckRequiredField() Then 4 MessageBox("Please complete the input data!") 5 Exit Sub 6 End If 7 8 Dim nRow As Integer 9 Dim Ctrl As Control 10 Dim chkDelete As Object 11 Dim LookupID, Name, Desc, Type As String 12 13 nRow = 0 14 15 For Each Ctrl In phLookUp.Controls 16 17 If Ctrl.GetType() Is GetType(CheckBox) Then 18 19 ' Checked = Request.Form("chkDelete" & nRow) 20 LookupID = Request.Form("txtLookupID" & nRow) 21 Name = Request.Form("txtName" & nRow) 22 Desc = Request.Form("txtDesc" & nRow) 23 Type = Request.Form("txtType" & nRow) 24 25 If CType(Ctrl, CheckBox).Checked Then '--> This is the line that causes error 26 ' 27 'delete 28 strSQL = "DELETE esd_lookup " & _ 29 "WHERE lookup_id = " & LookupID 30 31 objAdapter = New System.Data.OracleClient.OracleCommand(strSQL, objConnection) 32 33 objRec = objAdapter.ExecuteReader() 34 35 objRec.Close() 36 37 Else 38 39 If LookupID = "New" Then 40 'insert 41 strSQL = "INSERT INTO esd_lookup " & _ 42 "(lookup_id,lookup_type,lookup_desc,lookup_name)" & _ 43 " (select lookup_seq.nextval, '" & _ 44 UCase(Type) & "','" & _ 45 Desc & "','" & _ 46 Name & "' from dual) " 47 48 objAdapter = New System.Data.OracleClient.OracleCommand(strSQL, objConnection) 49 50 objRec = objAdapter.ExecuteReader() 51 52 objRec.Close() 53 54 Else 55 'update 56 strSQL = "UPDATE esd_lookup " & _ 57 "SET lookup_desc = '" & Desc & "' " & _ 58 ",lookup_name = '" & Name & "' " & _ 59 "where lookup_id = '" & LookupID & "'" 60 61 objAdapter = New System.Data.OracleClient.OracleCommand(strSQL, objConnection) 62 63 objRec = objAdapter.ExecuteReader() 64 65 objRec.Close() 66 67 End If 68 69 End If 70 71 nRow += 1 72 73 End If 74 75 Next 76 77 Select Case Type 78 Case "MACHINE" 79 Type = "Machine" 80 81 Case Else 82 83 End Select 84 85 86 87 txtItemCountAdd.text = 0 88 Call Header() 89 Call Item(Type) 90 91 End Sub
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svanistelrooy901
1/24/2008 1:55:00 AM
asp.net.getting-started
91979 articles. 
4 followers.
7 Replies
4015 Views
Maybe instead of this...
Dim Ctrl As ControlYou can try this...Dim Ctrl As WebControl
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Galoopta
1/24/2008 3:20:59 AM
It solve the initial problem, but then new problem arise, which stated
"Unable to cast object of type 'System.Web.UI.HTMLControls.HtmlGenericControls' to type 'System.Web.UI.WebControls.WebControl'
It comes from this line
For Each Ctrl In phLookUp.Controls
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svanistelrooy901
1/24/2008 3:47:55 AM
Looks like it should work, since WebControl also inherits from Control. Are you using any custom controls in your phLookup placeholder that inherits from checkbox? If so that would probably cause this error.
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Snowst
1/24/2008 3:49:02 AM
Web Server controls and HTML Controls cannot be mixed. If I were you, I would replace your HTML controls with their Web Server equivalent. You should only use HTML controls if you need to do heavy client-side Javascript or converting an old ASP application to .NET .
Please do not forget to "Mark as correct answer" if your issue has been resolved.
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Galoopta
1/24/2008 4:03:45 AM
I think it does use web server control Galoopta (by the way, i don't write the code, someone else did). I could be wrong. Glad to show the entire code of the page if you want to. The thing is, it works well before this, even yesterday. But suddenly gives error. I'm clueless right now
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svanistelrooy901
1/24/2008 6:22:15 AM
I change the codeline...
Dim Ctrl As ControlTo...
Dim Ctrl As System.Web.UI.ControlIt works. But I don't understand why putting the Imports System.Web.UI.Control or Imports System.Web.UI statement at the top didn't work.
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svanistelrooy901
1/24/2008 6:53:14 AM
Glad you got it working but like you said, that should not make a difference unless you are getting your scope mixed up with some other control named "Ctrl"
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Galoopta
1/27/2008 7:50:54 PM
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I am attempting to "Update" a field in a Datagrid, but no matter what I do (Using either Label or Text Boxes) I keep getting the same error: Unable to cast object of type 'System.Web.UI.WebControls.Label' to type 'System.Web.UI.WebControls.TextBox' The Error is highlighted below in the Sub... <==THE FIELD THAT CALLS THE ERROR Any help would be greatly appreciated !!! Thanks !! The code is as follows... <table border=0 height=210 bordercolor=olive ><tr valign=top><td> <asp:datagrid id="FacilityDataGrid" runat="server" Font-Names="Arial" Font-Size="11px" HorizontalAlign="Left" ItemStyle-Font-Size="x-small" HeaderStyle-Font-Bold="True"HeaderStyle-Font-Size="x-small" AlternatingItemStyle-BackColor="#FFFFFF" Cellpadding="0" BorderWidth="0"AutoGenerateColumns="False" BorderStyle="None" GridLines="None" BorderColor="#404040" Width="75%"DataKeyField="FacilityID"OnUpdateCommand="MyDataGrid_UpdateCommand"OnCancelCommand="MyDataGrid_CancelCommand"OnEditCommand="DG_Combo_Edit"> <AlternatingItemStyle BackColor="#FFFFFF"></AlternatingItemStyle><ItemStyle Font-Size="X-Small"></ItemStyle><HeaderStyle Font-Size="X-Small" Font-Bold="True" ForeCo...
Unable to cast object of type 'System.Web.UI.WebControls.FormView' to type 'System.Web.UI.WebControls.DropDownList'.
Hi, I have a formview with a dropdownlist created dynamically. i want to determine whether the dropdownlist was clicked. the code is written in the FormView1_DataBound method. I get the following error in the line below that is in italics and underlined: Unable to cast object of type 'System.Web.UI.WebControls.FormView' to type 'System.Web.UI.WebControls.DropDownList'. Here is my code: ddl_iFullname = New DropDownList ddl_iFullname.ID = "ddl_iFullname" ddl_iFullname.DataSource = ObjectDataSource3 ddl_iFullname.DataTextField = "fullname" ddl_iFullname.DataValueField = "...
Value of type 'Integer' cannot converted to 'System.Web.UI.WebControls.Unit'
I'd like to dynamically change the size of controls such as panel.In the code I putmainPage.Height = 500 'mainPage is a PanelHowever, it failed to compile with message;Value of type 'Integer' cannot converted to 'System.Web.UI.WebControls.Unit'How can I change the code so that it compiles? mainPage.Height = Unit.Pixel(500) 'mainPage is a PanelSonu Kapoor [MVP] Feel free to ask me any .NET question | Ajax Data Controls Forum It works very well. Thanks a lot....
Value of type 'String' cannot be converted to 'System.Web.UI.WebControls.TextBox'
I have a new page (wireframe) based on the User_Create page in the Time Tracker starter kit. I have no code in the code behind page. What might be causing this error? This newbie needs help. I had a TextBox control named "Title" which appearantly conflicted with the page title. thanks!!! ...
Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.TextBox'
Hello, Goal: enter a number in two fields HoursPerUnit and PeoplePerUnit and the value for the third field, TotalHoursPerUnit will populate after the the number in the two fields have been caculated. Using the code below I receive the error message above. Please tell me what am I doing wrong? Do I need to cast the text as a literal? Please help? Thank you in advance, <%@ Page Language="VB" MasterPageFile="Default.master" AutoEventWireup="false" CodeFile="frmHR.aspx.vb" Inherits="frmHR" title="HR" %><asp:Content ID="Content1" ContentPlaceHolderID="Main" Runat="Server"> HR<br /><script language =javascript type="text/javascript">function Calculate(HoursPerUnit, PeoplePerUnit, TotalHoursPerUnit){ TotalHoursPerUnit.value = HoursPerUnit.value * PeoplePerUnit.value;} </script> <br /> <asp:LinkButton ID="CheckAll" runat="server">Check All</asp:LinkButton> <asp:LinkButton ID="UncheckAll" runat="server">Uncheck All</asp:LinkButton><br /> <br /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="HR...
Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.TextBox'.
Hi, any idea why I'm getting the following error?Line 45: protected void CartGrid_RowUpdating(object sender, System.Web.UI.WebControls.GridViewUpdateEventArgs e) Line 46: { Line 47: TextBox QuantityTextBox = (TextBox)CartGrid.Rows[e.RowIndex].Cells[2].Controls[0]; Line 48: int Quantity = Convert.ToInt32(QuantityTextBox.Text); Line 49: Are you sure that the control at CartGrid.Rows[e.RowIndex].Cells[2].Controls[0] isn't a LiteralControl? How are you creating code this in your code?Brent JenkinsASP.NET, C#, Web Developerwww.valewebdesign.co.uk ...
Compiler Error Message: BC30311: Value of type 'System.Web.UI.DataSourceSelectArguments' cannot be converted to 'Integer'.
Hello, I'm wondering if someone can help me figure out why I'm receiving the above error message..."Compiler Error Message: BC30311: Value of type 'System.Web.UI.DataSourceSelectArguments' cannot be converted to 'Integer'." In visual web developer, the blue line is pointing out the variables args, on line 15. 1 Imports System.Data 2 Partial Class POS_so_Default 3 Inherits System.Web.UI.Page 4 5 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 6 customer...
Cannot convert type 'System.Web.UI.Control' to 'FileUpload'
Hi,I'm getting an error in the follow code:FileUpload fileUpload1 = (FileUpload)itemPanel.FindControl("fuDoc");Where itemPanel is a AjaxControlToolkit.TabPanel and the aspx code is: <asp:FileUpload ID="fuDocument_es" runat="server" />The error is Cannot convert type 'System.Web.UI.Control' to 'FileUpload' Why? Thanks You are trying to find and convert "fuDoc" or "fuDocument_es" ?try thisFileUpload fileUpload1 = (FileUpload)itemPanel.FindControl("fuDocument_es");...
Cannot convert type 'System.Web.UI.WebControls.TableCell' to 'byte[]' !!!
//Get image data from gridview column. //byte[] imageData; //(int a []) GridView1.Rows[e.RowIndex].Cells[2]; byte[] imageData = (byte[])GridView1.Rows[e.RowIndex].Cells[1]; <-- Having Error HERE! ...
Cannot implicitly convert type 'System.Web.UI.WebControls.Label' to 'string'
I have a datagridLabel ID1 = (Label)(e.Item.FindControl("ID1")); Label Name1 = (Label)(e.Item.FindControl("Name1")); Label TableName = (Label)(e.Item.FindControl("TableName")); No0w Iam trying to TBTableName.Text = lblTableName; tbid.Text = lblImageTypeID1; tbnameordes.Text = lblImageName1; I have tried l lbltablename.text,.tostring,convert.t...
Cannot implicitely convert type 'string' to 'System.Web.UI.WebControls.Label'
I'm starting to make a website for users to login. Once they login, I'm showing their profile. So I populate some asp:label controls on Page_Load. My profile page (shown after the user logs in) contains: <%@ Page Language="C#" MasterPageFile="~/site.master" CodeFile="clientProfile.aspx.cs" Inherits="clientProfile" AutoEventWireup="true" Title="Car Look - Your profile" %> <asp:Content ID="Content1" ContentPlaceHolderID="mainContent" Runat="Server"> <div> &l...
Cannot implicitly convert type 'Login' to 'System.Web.UI.WebControls.Login'
hello i have got this error on this part of code :protected void Wizard1_NextButtonClick(object sender, System.Web.UI.WebControls.WizardNavigationEventArgs e) {if (e.CurrentStepIndex == 0) {System.Web.UI.WebControls.Login l = (Login)Wizard1.FindControl("Login1");if (Membership.ValidateUser(l.UserName, l.Password)) { FormsAuthentication.SetAuthCookie(l.UserName, l.RememberMeSet);e.Cancel = false; } else {l.InstructionText = "Your login attempt was not successful. Please try again."; l.InstructionTextStyle.ForeColor = System.Drawing.Color.Red;e.Cancel = ...
Error: Value of type 'String' cannot be converted to 'System.Web.UI.WebControls.Label
Here is the code:Dim dato_start_2 as DateTime Dim varighet_str as string Dim dato_differanse as string dato_start_2 = tabell_2.Rows(DataGrid1.SelectedIndex).Item("dato_tid_sendt") dato_differanse = DateDiff(DateInterval.Day, dato_start_2, now) Label12 = "" & dato_differanse & "" ........and theCompiler Error Message: BC30311: Value of type 'String' cannot be converted to 'System.Web.UI.WebControls.Label'.Why and how?RegardsLars/Norway To set a text for a Label you need to use its Text property, in your code you try to set the Label to a Text and that is the reason why you g...
Operator '&' is not defined for types 'String' and 'System.Web.UI.WebControls.TextBox'
Can anyone tell me what this error message means, and what to do to correct it. Here is the code that has the error: Dim sql As Stringsql = "INSERT INTO tblConnecting (Date, Member, Name, Company, Phone, Fax, Address, NamesofAttendees, PaymentType, Email) " _ & "Values('" & Today() & "', '" & blnMember & "', '" & Me.txtName.Text & "', '" & Me.txtCompany.Text & "', '" _& Me.txtPhone.Text & "', '" & Me.txtFax.Text &...
Value of type 'System.Net.Mail.MailMessage' cannot be converted to 'System.Net.Mail.AlternateView'
Trying to create an alternateview to send a txt email with the html formatted email. I've used string builder to create the whole email, but I get this error. Any ideas why? i've bolded the line that throws the error... Dim EmailBodyTxt As New StringBuilder EmailBodyTxt.Append("<html><style type='text/css'>.table{border:solid; border-color:#006666; width:600;} ")EmailBodyTxt.Append("<body><table class='table'><tr><td colspan='2'><h1>Test<br />RESPONSE SYSTEM</h1></td>...
Web resources about - BC30311: Value of type 'Control' cannot be converted to 'System.Web.UI.WebControls.CheckBox' - asp.net.getting-startedResources last updated: 3/5/2016 8:35:38 PM