How To Populate GridView.DataKeyNames Constructing Array From Within Loop
Mar 10, 2010
I have to set GridView.DataKeyNames(This is really a question about the syntax for a string array, in VB.Net.)I am discovering the PrimaryKey columns names from within a loop, ie:For Each fld As IEntityField In Me.llbDataSource.EntityCollection(0).PrimaryKeyFields'fld.Name ' this is where the column name is stored, so I have to get this into an array Next..[code]So, basically, how does one declare a string array (as required by GridView.DataKeyNames), and then populate the elements of the array from within a loop?
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Aug 4, 2011
I have a specific problem that I have not yet found an answer to. Basically I need to pass a list of numbers into a function do some math and return them. I can pass one number at a time without a problem, however when I want to pass in an array I start to have issues. My VB.net code looks like this...
[Code]...
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Mar 14, 2009
I need to get the DataKeyNames in codebehind of my ASP.NET application (VB.NET). How can I get that?
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Mar 5, 2012
I have created a connection string, and i am populating a dropdownlist with an ID from a sql database.I want to be able to click on a ID from the dropdownlist and run a query to populate a gridview with data. I have made the dropdownlist autopostback = Enabled. I am not getting an error.
Here is my code:
Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlContracts.SelectedIndexChanged
Dim ds As New DataSet
[code]....
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Feb 15, 2012
I want to populate a checkbox field in a gridview.
I am using the Checked='<%# Convert.ToBoolean(Eval("Inactive")) %>' statement but the issue that I am facing is that in the database some records contain NULL for Inactive. If it encounters a 0 or 1 value it works fine but if NULL it throws an exception.
Kindly guide me how to populate the checkbox so that it should be unchecked even if the field is null.
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Mar 1, 2009
need to populate a gridview using a StoredProc calledspListRetailLocations
My code is as follows:
dr = SQLDataReaderdr = SQLHelper.ExecuteReader(strConn, CommandType.StoreProcedure. "spListRetailLocations")
[code].....
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Feb 16, 2010
I'd like to have a backgroundworker process data that will eventually populate a gridview in my windows form. I need to use a backgroundworker because the process takes a little while, normally causing the program to slow/freeze until it's opening and streaming connections.. So, I'm using a background worker to perform these methods.How can I take the data from the background worker (on a separate thread than the UI) and use it to populate controls in the UI?
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Aug 31, 2010
It has been so long since I have coded a page in VB. For the life of me I just cannot remember how to do this. I have a GridView on an ASP page. Each row has a comment ImageButton. I already have the gridview and text box wrapped in a UpdatePanel. The gridview shows all of the correct information. I just need to add some code to populate the text box with the comment when a user clicks on that row's ImageButton.
The comments are stored in SQL 2005 DB if that makes a difference. Should I shove the comments inside a hidden field of the gridview or is there a function that will allow me to query the db for that specific comment. End goal would be to not refresh the page if possible.
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Jul 22, 2009
If I used a generic list Class to hold data objects that I am pulling from SQL Server using Linq to sql to populate a datagridview would I need to make any modifications to the datagridview control to accomodate multiple columns or would I need to make any modifications to the generic list class to accomodate the multiple columns in a row that is typical of a record in SQL Server? And one more thing which I believe is the easy part. To bind the list to a datagrid view would I just use the datasource property of the datagridview control.
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Jul 22, 2009
I am using a gridview in my form.aspx page. The textboxes in each row of the gridview are to be populated from a datagrid upon clicking a particular field of the datagrid
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Mar 10, 2010
I have a typical data entry form to show one Customer. All textboxes, controls, etc. are bound to a BindingSource.
Clicking a button, I pop up another form with a DataGrid to show all Customers in a table, this way:
VB
Sub btn_Click
Dim frmPopUp As New frmSearch
frmPopUp.BindingSource1.DataSource = Me.BindingSource1
[Code].....
How can I populate the fields in Form1 selecting a row of the grid in frmSearch?
What I need, is to synchronize the databindings (I think).
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Jun 17, 2011
I have a table in Oracle that has a column with the Long data type. I create a simple recordset and bind it to a gridview.
Me.grdFollowup.DataSource = rsDataSet
Me.grdFollowup.DataBind()
All of the columns populate correctly except for the Long column. It returns a null for all rows. I have tested the SQL statement in Toad and it works perfectly. how to get an Oracle Long data type to populate in a gridview? This is driving me nuts
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Aug 15, 2011
I have a form which populates a TextBox I want to use the textBox.text to then load a gridView with the results
[code]...
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Aug 5, 2011
I have a gridview as follows
<asp:GridView ID="productListTable" runat="server" DataSourceID="srcProductListPerCustomer" AutoGenerateColumns="False" AlternatingRowStyle-CssClass="tr_dark" HeaderStyle-CssClass="header_req"
[Code]....
And it actually seems to work on first instance (altho im not sure the above is a good way to do it, but the problem is when use the pagination on the gridview I get the error
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
On the line
Dim productId As String = productListTable.DataKeys(i).Value
why I am getting this error and also is there a better way to do it ?
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Jan 6, 2012
How do I loop through a dataset and populate a DataGridView - heres my code. Hopefully someone can point out where Im going wrong... Not getting a specific error, just failed message box. when i take out the try/catch function then Im given no error but the DataGridView does not populate.
[Code]...
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Mar 9, 2009
why I cannot populate the data grid with the results of my loop>
Public Class FormInput
'The disabled close button declarations;written by Achmad Zeanuri
Private Const MF_BYPOSITION = &H400
[Code].....
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Jan 16, 2012
I'm trying to loop through an xml and out put the nodes into a gridview.this is the code I'm using:[code]....I only get the last node added, how can I output all the matching nodes.
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Nov 25, 2011
I am trying to loop through the rows of my gridview and retrieve the data key value of each row and then execute some code to run sql queries. How can I get the data key value of each row in variable? right now I am receiving an error message saying:
value of type system.web.ui.webcontrols.datakey cannot be converted to integer.
Here is my code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
For Each row As GridViewRow In GridView1.Rows
Dim therowindex As Integer = row.RowIndex
[code]....
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Feb 20, 2009
For Each gvRow As GridViewRow In gvClients.Rows
cmdExcel.CommandText = "INSERT INTO [Sheet2$] (tvlr_Lastname, tvlr_Firstname,tvlr_title)" & " values (@Surname,@FName,@Title)"
cmdExcel.Parameters.AddWithValue("@Surname", gvRow.Cells(0).Text)
[Code].....
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Jul 4, 2011
I Have the following:
[Code]...
"Warning: Variable 'PDU_messages' is used before it has been assigned a value. A null reference exception could result at runtime." and then on running, Object reference not set to an instance of an object.
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Oct 18, 2011
I know how to loop through a GridView and extract each row using the for each loop as below, but I was looking for a easy way to loop through the datagrid and say extract the last 20 rows? Is it possible to go through in reverse order in vb.net?
For Each row As GridViewRow In InventHistoryGridView.Rows
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May 11, 2011
Create A Loop To Retrieve A Column Of Data From Gridview
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Jun 5, 2011
constructing a waveform in vb.net. Can maybe someone give me a hint of how to make one? (a bit of code would be nice) I already know that to generate a waveform, you need a timer, if there anything else?
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Feb 11, 2011
I am having trouble constructing an SQL UPDATE string to do the following.
Table A (field, type) Table B
ID (key) Integer ID (key) Integer
ParentID Integer IssueID Integer
Number String ParentID Integer
[Code]...
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Jan 11, 2011
Following code below. I will explane what it does and it needs to do.
Its a query that fills a gridview. Everything thats in the gridview needs to be exported to a excelsheet.
I've got it working that when i fill it, it will fil the sheet with only the same line. Im not a prof VS developer.
Code:
Now the problem is the following.
Code:
It need to pick up each line but it only picks up the first line and duplicate's it.
I left the qeury line out for privacy reasons.
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Sep 15, 2009
Is there a way to dynamically create properties at runtime in VB .NET using introspection?
e.g. Suppose I had a class
Public Class Foo
Public Property Bar() As String
get
...
end get
[code]....
Is there a way to create property Bar at runtime?
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Feb 24, 2012
I'm trying to populate an array from a dataset with only specific column using vb.net 2010. is there any code to populate the array directly or must i make the use of a query?
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Oct 2, 2009
I've been working in .NET for some time now, but occasionally I still get confused by a disparity between the framework and my prior experience in C++.In .NET, all objects are either value types or reference types. Reference types are allocated on the heap while value types are allocated on the stack (in the current CLR implementation, anyway). I get that. However, at least in VB.NET, you can still define a constructor on a value type.
Public Structure Coordinates
Public x As Integer
Public y As Integer
[code]....
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Apr 15, 2010
I'm not entirely sure what to call what C# does, so I haven't had any luck searching for the VB.Net equivalent syntax (if it exists, which I suspect it probably doesn't).
In c#, you can do this:
public void DoSomething() {
new MyHelper().DoIt(); // works just fine
}
But as far as I can tell, in VB.Net, you must assign the helper object to a local variable or you just get a syntax error:
Public Sub DoSomething()
New MyHelper().DoIt() ' won't compile
End Sub
Just one of those curiosity things I run into from day to day working on mixed language projects - often there is a VB.Net equivalent which uses less than obvious syntax. Anyone?
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Feb 11, 2011
I've used VB.net for several years now, but keep coming across little quirks that I don't know how to work around. Curiosity finally got the best of me, so I ask now: is there a way to create an object without assigning it?For example, say I have an Engine class, that I want to instantiate and have it immediately do whatever it needs to do. If there's nothing I need to do with Engine after creating it, I have, till now, done something like:dim myEngine as new Engine()Is there a way to avoid the "dim myEngine as" part? You certainly can in Java. I could just create an object with "new Engine()" in java and not assign it to anything.
Why do I need this? Because often I want to create a delegate object (hence I called it "engine") that performs some functionality, but otherwise I don't need to ever reference it. I used to have such objects have a "public sub perform", but have found that cumbersome -- I'd rather just create the object and not worry about remembering to call its perform method. And I find it aesthetically displeasing to create references to objects that I don't intend to use
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