I have my Access database bound to a Gridview and an able to Edit and Update the Grid as long as all columns are set to ReadOnly=False. If I make one or more columns ReadOnly=True I get the following error on updating: You tried to assign the Null value to a variable that is not a Variant data type How do I get past that problem?
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How do I assign database to AccessDataSource control dynamically.
If I load aspx page by mypage.aspx?DB=100 then I want to use 100.mdb as data base
If I load aspx page by mypage.aspx?DB=200 then I want to use 200.mdb as data base
Both databases are identical except for the fact that data is different.
Here's default code - Need to replace Bold Code with equivalent of DataFile = response.querystring("DB") + ".mdb"
<asp:AccessDataSource ID="AccessDataSource1" runat="server"
DataFile="c: rims2k�00001000.mdb"
SelectCommand="SELECT * FROM [EquipmentUsage]"></asp:AccessDataSource>
I would like to enquire about a seemingly basic problem that i am struggeling with. I have been trying to add information to an access database and as i am inserting this information I get the error message stating that I tried to assign the Null value to a variable that is not a Variant type. I was thinking that it could have something to do with the primary key being set to automatic number but this also does not seem the problem.
View 2 RepliesI have this
var result = general.GetInformation(int.Parse(ID), F_account, F_Info, Types);
this GetInformation is my Entity.Getinformation class.. when I am trying to assign result globly I am getting Cannot Assign to implicit typed local variable?
var result = ?
what should I assign in global?
When I add an AccessDataSource and attempt to configure it, the "Advanced SQL Generation Options" panel opens, but checkboxes "Generate INSERT, UPDATE and DELETE statements" and "Use optimistic concurrency" are sometimes grayed out.It appears that this happens when a table is specified that contains a foreign key, and it also seems that any Update query statement I specify in conjunction with a related databound gridview doesn't "take". What's the story here? Is it not possible to update a database table from a databound gridview control if the underlying table has a foreign key? Or is something else going on?
View 2 RepliesI am using three listviews on a page ... the first is always populated ... the other two are sometimes populated I want to total amounts and counts from all three ... so I set up steps in the DataBound events works great when all three listviews are populated the error "Object Variable or With block variable not set." occurs when LV2 or LV3 is not populated I've tried testing DataItem ... Is Nothing but get the failure on the If test instead
View 3 RepliesI have a GridView where I am displaying the students List who ware absent for "ASP.Net Class" If Teacher 1 login then it is displying all the records who ware absent and same for remaining teachers. I want to display those records where TecherId matched..
I wrote query like this :
Select StudName FROM Class where Status LIKE 'ABSENT' AND Teacher Id =?
But every teachers(User) are getting everyone's data....
I am using AccessDataSource and displying in GridView....
I'm using an access database that has an AutoNumber field as the primary key. After adding a record I'd like to retrieve the ID for the record that was just entered, however, I'm not able to figure out how to do this in ASP.NET using standard AccesDataSource and FormView functionality. My goal is to retrieve the ID so that I can then use it to add an additional record in a child / sub table.
I could do it strictly using vb.net and forget about using the InsertCommand for the AccessDataSource and it's built in functionality. However, that would require a complete rewrite of some other items, accomplish this using the standard AccesDataSource functionality.
Below is a sample of something I've tried to do using "Direction='Output'" on one of the ID field for one of Insert paramaters (source: http://www.4guysfromrolla.com/articles/050207-1.aspx). The plan was to then caputre that "output" using the my "_OnInserted" sub procedue. However, apparantly I'm not able to use this with AccessDataSource. Did some research and saw that I'd have to switch to SqlDataSource which I'd rather not do cause all other pages use AccessDataSource and I'm having problems defining my connection string with it.
Html:
<html>
<body>
<form runat="server" id="Form1" method="post" encType="multipart/form-data">
<asp:FormView runat="server"
id="FormView1"
DataSourceID="DataSourceFormView1"
[Code]....
I want to access drop down menu's variable in java script on change event, here is my code
<asp:DropDownList ID="DropDownList1" runat="server" onchange="document.location.href = url_Lookbook;" >
<asp:ListItem Value="0">hello</asp:ListItem>
<asp:ListItem Value="1">world</asp:ListItem>
</asp:DropDownList>
here is the script coding:
<script type="text/javascript">
var url_Lookbook = "http://microsoft.com";
</script>
My question is how do I pass down value=0 or value = 1 to different page
i have written following code to access public variable of asp.net onclick event on button but its not giving me desired output.. please check it:
<asp:Button runat="server" CssClass="txtdisplay" ID="Button1"
Text="Browse all jobs in area"
OnClientClick="return navigateURL('index.aspx?c=<%=cityid %>')" />
I have a problem with a SessionVariable. I will explain what is happening:
1. From the default.aspx I send Session["LoginByAdmin"] = "Dummy"; and then redirect to this page where I have the code below. So the Page_Load sees that this Session["LoginByAdmin"] != null and enter this page. This works fine !
2. In the Page_Load, I later fill a ListBox1 with foldernames.
3. With Button1_Click1, I will now delete the choosen Folder in the ListBox1 wich works fine the first time and the ListBox updates the new existing folders in the ListBox. (I have wrapped this inside an updatepanel)
The problems comes now when I try to delete a choosen folder in the ListBox1 the second time in a row. When I select a Folder in the ListBox1 and now Press Button1, I will be redirected to "Default.aspx". This meens that this code is running: (That meens that Session["LoginByAdmin"] == null and I have not set this to null anywhere. This is my big question how this variable can be = null here?
if (Session["LoginByAdmin"] == null)
Response.Redirect("Default.aspx");
break;
[Code]....
I have a gridview,when i do it is giving me null object reference error.
I am posting my code for your reference -
[Code]....
My gridview code is -
[Code]....
I have a masterpage that contains all the javascript and inside the content control, there is a link that calls a javascript function and I want to pass the id once it's rendered differently by the server.
<asp:TextBox ID="txtstart" runat="server" Width="20%"></asp:TextBox>
<a title="Pick Date from Calendar" onclick="calendarPicker('<% txtstart.ClientId %>');" href="javascript:void(0);">
However, I keep getting this error:
Property access must assign to the property or use its value.
How would I be able to accomplish this?
Can I assign the result of an SQL select command to a local variable in ASP.NET?
View 3 Repliesi have to assign value to bit varibale.so i declared bool variable . i am assigning string value to a bool variable . so i converted to boolean & assigned.Its not converting to bool..How to assign string value to bit variable.?i am getting error.Object reference not set to an instance of an object
[Code]....
How can i assign value to javasctipt variable from code-behind (C#)?
<script type="text/javascript">
String.prototype.trim = function () { return this.replace(/^s+|s+$/, ''); };
function ConstantByCode(_Obj, _Div) {
var pl = new SOAPClientParameters();
_Obj.value = _Obj.value.trim();
pl.add("Code", _Obj.value);
[code]...
I want to assign a csharp variable to the element of asp page using javascript. It seems the assignement is not working in my code.
document.getElementById('lbAccessories').innerHTML = '<%#SelectLabel%>';
<asp:LinkButton ID="lbAccessories" runat="server" />'
Text='<%#SelectLabel%>' because i want to make it more intelligent.
e="text/javascript">
function function(Ref) {
[code]...
I am using asp.net and C#. I want to send mail to my user in HTML format, I have the content in HTML format let say like this
<table style="width:100%;">
<tr>
<td style="width:20%; background-color:Blue;"></td>
<td style="width:80%; background-color:Green;"></td>
</tr>
</table>
Now I am unable to assign this to a string variable, so that I could send it as a mail. how can I bind this whole HTML content into a varibale.
I'm creating an ASP.NET web application using C# and I want to know how I could assign an integer variable to the cell of a table. I could easily do it using a text-box and label but I'd like to use a table if possible.
I'm using Microsoft Visual Studio 2010 Ultimate
Right now I am using a grid control from ComponentOne which I have to stay with. When I click an link in the row which fires a grid_ItemCommand event one of the parameters passed is e As C1.Web.C1WebGrid.C1CommandEventArgs. I want to change it where I am selecting a row with a checkbox in a column and then click a button to process the row selected. So I need to get the value it is putting in e and pass that which is used in another sub.
Here is how e is assigned to "row" as DataRow.
Code:
Private Sub grid_ItemCommand(ByVal sender As Object, ByVal e As C1.Web.C1WebGrid.C1CommandEventArgs) Handles grid.ItemCommand
Select Case e.CommandName
Case "Renew" ' Renew barcode
Dim row As DataRow = CType(e.Item.DataItem, DataRowView).Row
I'm creating an ASP.NET web application using C# and I want to know how I could assign an integer variable to the cell of a table. I could easily do it using a text-box and label but I'd like to use a table if possible.
I'm using Microsoft Visual Studio 2010 Ultimate
I'm writing an update statement to update a user's password in the linked Access Database when they input (and confirm the input) of the new password in a textbox on my webpage.
The SQL statement that is being generated is - UPDATE tblUser SET [Password]=[chuck68] WHERE UserID=0000009
With tblUser being the correct name for the table, Password being the correct name for the field I wish to change and UserID being the linked field to lookup the password from.
The entirety of my code is as follows: (with the necessary import statement at the top of the class).
Protected Sub ChangePasswordButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ChangePasswordButton.Click
How to assign a array string session to dataset or datatable? I have a array session data in that i stored n number of values. i want to assign these values to dataset. so that i can bind these values to gridview. so anyone pls let me know how to do this? Iam getting error to convert sesion{"noncontractitem"] to datatable.
string[] sessiondata = { txtProductNo.Text, txtItemDescription.Text, ddlUnitOfMeasure.Text, ddlDistributor.Text, rbtlItemType.Text, txtQnty.Text, txtPacking.Text, txtUnitCost.Text };
Session["NoncontractItem"] = sessiondata;
DataTable dts = new DataTable();
dts = (DataTable)Session["NoncontractItem"];
grdSelectedItems.DataSource = dts;
grdSelectedItems.DataBind();
i got one register page and register confirmation pagethe first page i use it to let user enter all the data to registerfor the second page, i put a createuserwizard and use session to display all the entered data here problem is, all the data in label form can show except username, password and e-mailWhich i make them textboxI have declare them in the Page_Load (I use username only as example since all field is about the same)
[Code]...
Question. Say for example if i have a business entity -> Customer, which has customerId, customerName and customerType. I have created an asp:Hidden Variable hdnCustomer to runat="server"
If i wanted to serialize the value of the customer business entity (in the code behind) to the hdnCustomer then how would i do that?
// Psudo code
Collection customerList = new Collection();
customerList = BusinessAccess.GetCustomerList();
hdnCustomer = serialize and assign the value of 'customerList' to hdnCustomer;
...
...
// Later on a select index change of one of the drop down lists
inside the event handler for the drop down list
{
Collection customerList = new Collection();
customerList = deserialize the value from hdnCustomer
int a = Convert.ToInt32(ddlDropDown.SelectedValue);
foreach(a in customerList)
{
// Do something
}
}
