Duplicate Values In A Datagrid?

Feb 26, 2012

I'm using an unbound data grid in Visual Basic. I made the following loop for the purpose of searching each cell and each column for a duplicate value. But for some reason I get a "InvalidCastException" when I try to add a second row.

Private Sub AddJudgeBtn_Click(sender As System.Object, e As System.EventArgs) Handles AddJudgeBtn.Click
Dim exists As Boolean
' ToDo: If the value entered is already on the list, don't add again.
If JudgeList.Rows.Count() > 0 Then

[code]...

EDIT: Adding the entire click event.

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I need to validate a particular coloumn in datagrid for duplicate values before inserting into database. I am using datatable.

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I am trying to get duplicate values from dgv into a combo:

[Code]...

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m_ListOfsAllFields.OrderBy(Function(x) x.DisplayOrder)

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Get Random value with no duplicate

[Code]...

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Jan 20, 2009

I have a fairly large Drop down menu:

<asp:DropDownList ID="DropDownList8" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList8_SelectedIndexChanged">
<asp:ListItem Value="" Selected="True"></asp:ListItem>

[code]......

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Nov 7, 2010

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Apr 14, 2011

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Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
'get values

[code].....

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Delete Excel Columns And Duplicate Values

Jul 5, 2011

I am trying to create a .Net application to edit a excel file by deleting some columns and keeping the columns which we need and then removing the duplicate values based on the first column which is going to be the Serial no. which should have a check to have 6 digits by default like 2563 should be displayed as 002563.

Code:
Public Function GetAllFileContents(ByVal path As String, ByRef errorMessage As String) As IList(Of String)
Dim contents = New List(Of String)
Try
Dim files = Directory.GetFiles(path, "*.xls")
If (files.Length = 0) Then errorMessage = "Please select the files"
For Each file In files
[Code] .....

I am trying to create something different by not only letting me do it for excel files but for say txt and csv files along with it. Removing all the values which I dont want and removing the duplicates and then if possible putting a check on the first column of data that the serial number number should have minimum of 6 characters and then The output file should have all the details in Uppercase

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How do I prevent users from a inserting a duplicate value using SQL Query

datatype is VarChar(50)

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Feb 4, 2011

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[Code]...

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VS 2008 Updating Database - Producing Duplicate Values

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Here is my
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=BHgardeners11.mdb;")
cn.Open()
Try
str = "UPDATE Products SET ProductCode = ?, ProductManufacturerCode = ?, ProductsTitle = ?,
[Code] .....

If there is only one item in the database, then this code works. If there is more than one record then the error is produced that it is trying to produce duplicate values. This is down to the Primary key in my database which is the only thing that cannot have duplicate values. However, when I remove the primary key it has the predictable problem that it goes crazy and does weird things.

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Apr 4, 2011

I had restart my program for 5 times, and i still can get through it. the due date just around the corner.

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So, if I have a list of PlanObjects like such.
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Plan2.PlanId = 1
Plan3.PlanId = 2
Plan4.PlanId = 3
Plan5.PlanId = 4
Plan6.PlanId = 4

I want to take a sub-list from that with LINQ (italics mean an item is not included)
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Plan2.PlanId = 1
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I'm using the datagridview. This is the sample data:

[Code]....

How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?

[Code]....

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This is really confusing me. No matter what I insert, it still gives me the same error. And I don't understand why it's giving me an error even though it's working. Here's my codebehind:

Protected Sub Wizard1_FinishButtonClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.WizardNavigationEventArgs) Handles Wizard1.FinishButtonClick

[Code]....

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i try this but nothing hapen

for i = 1 to 15
grdTest.Rows.Add

'I need thsi part here where you set column name and the value to insert

next i

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Dec 1, 2010

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[URL]

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Calculate Values On Datagrid?[code]...

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