Determine Datagridview Change Or Not?
Aug 10, 2009How can i determine datagridview 's datatable change or not when i leave it.
If datagridview change then my value return true else it ll return false.
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Determine Key Points In Change In Frequency?
Sep 29, 2011I have an application in which I am analyzing a system where there are a large number of interactions. And I need to make certain choices based on the frequency of the occurrences of unique items in the system. For example, if you had this list of letters:A, B, F, G, A, T, S, B, S, B, S, Q, Z, B, Q, S..[code]The above is a tiny example, but I've attached an image which is a simple line graph of a larger system..In this graph the numbers along the bottom aren't really important. They are just marking the number of unique frequencies. And the Y-axis marks the value of that frequency. What I'm looking for is a mathematical/programmatic way to find the point where that line begins to break upwards. My searches haven't yielded what I'm looking for as I'm not really sure what the proper terminology is, or the name of the concept.Right now, we have to manually choose that point based on a human looking at the numbers and saying "here". But I want to, at the very least, already have a "recommended" value chosen, and at the most, be able to remove the human component completely.
For clarification, my current algorithm is producing a list of number pairs occurrence to occurrence frequency. My use of the word "frequency" in no way relates to electromagnetic signals, but rather to how often an occurrence occurs. But I thought that saying "occurrence occurrences" would be more confusing! In this system, the general trend is that a few entities will show up in a large number of interactions, more entities will show up in a medium number of interactions, but the greatest number of entities will show up in just a few, or even no, interactions. It would be tough to imagine a scenario where it was different than that... worst case would probably be a plateau. But there could definitely be a dip after a jump at any point from the beginning to the end. The illustration above just doesn't show that. We cannot assume that there will be a point where it will begin to rise with no drops afterwards.Ultimately what I'm trying to determine is the importance of an entity based on how often it occurs in the system. I need to be able to flag certain items as "important", but all items can't be important. And the method/algorithm I'm looking for would help to identify at what point in that list do I stop considering items important. If you look at the list, you can see where the lower occurrences start becoming more frequent. I don't think that I can sort on the right column because the left column is really the key data. Greater occurrences = more importance.
Determine Key Points In The Change In Frequency?
Oct 21, 2009Edit 9-7-2011: I am still hoping for an answer for this question. There's been a couple of good they have ultimately not sent me in the direction that helped me get the answer.I have an application in which I am analyzing a system where there are a large number of interactions. And I need to make certain choices based on the frequency of the occurrences of unique items in the system. For example, if you had this list of letters:
Here is a list showing how often each letter occurs (occurrences):
A - 2
B - 4
[code].....
Determine If User Or Program Made Change To Control
Mar 15, 2010I have numberic updown control in my app. There may be times when I want to programatically change the vlaue (in which case I don't want to ValueChanged event handler code to run). There will certainly be times when the user makes a change (in which case, I would want the event handler code to run).
[Code]...
Determine What Datagridview Have Just Clicked?
Aug 2, 2009Example i have a tabcontrol contains 4 tabpages.Each tabpage have a datagridview. I want when i click any datagridview in those tabpages then a msgbox ll show name of datagridview which has just clicked.I want to determine it. But i dont want to use method loop though controls of tabcontrol and check what datagridview visible.Shortly i want to determine what datagridview i clicked ?
View 12 RepliesDetermine DataTable Row Index From DataGridView
May 7, 2006I have a datatable with 10 records linked to a datagridview. When I initially load the datagridview, row 0 in the datagridview = row 0 in the datatable - based purely on the order they load, and the datatable's default sort order. I then filter my datagridview and am left with 5 records. Is there a way of determining programatically, the actual datatable row number of a row displayed in a datagridview, considering that row 0 in the datagridview is now not necessarily row 0 in the datatable?
View 6 RepliesDetermine Which Datagridview Visible On Button Click Event?
Aug 3, 2009I have a tabcontrol which contain 4 tabpages. Each tabpage have a datagridview.
When i select any tabpage the datagridview of it will show.
I want to check what datagridview is showwing(visible) in button1 click event.
I dont want to loop through controls thenafter check visible propety of control.
Change Textbox Depend On Selection Change In ComboBox Column Of Datagridview?
Dec 15, 2011I have a DGV I am working on, and I have many columns.
For example I have Columns colcase(Combobox), colreportTime(Time)
the combox shows 4 cases {A,B,C,D}
what I need to do is if the user select "C"
the the colreporttime will show the time of this change unless the old value is C
How To Make A Combox In A Datagridview Change Output In Textbox In Same Datagridview
Jan 29, 2010I am using VS2008 and I have a form which has a datagridview. This is for an invoice where I already have the user select the customer from a details view and want to have the items in the datagridview change based on what the customer selected. Then when the item is selected I want to have the price change accordingly.
So far I have the customer selction as well as the item combobox(not limited to cust items yet) appear, but I cannot figure out how to get the join of the 2 items (cust+item as the price varies from cust to cust) to change the price. Question is, is it possible to do this in the same datagridview, or should i try to just break this down some other way?
.net - Change The Value Of A Checkbox In A DataGridView?
Aug 21, 2009I have appended a column of checkboxes to a DataGridView using the following:
Dim chk As New DataGridViewCheckBoxColumn
DataGridView1.Columns.Insert(0, chk)
How do I change the checked state of a particular checkbox?
I have tried using the following code:
Dim val2 As DataGridViewCheckBoxCell = DataGridView1.Item(243, i)
val2.Value = True
DataGridView1.Item(243, i) = val2
The last line resulted in runtime error "InvalidOperationException was Unhandled
Cell provided already belong to a grid". Index 243 exists.
C# - Change The Datasource Of DataGridView?
Nov 17, 2010When I try to change the datasource of my DataGridView, I am loosing the order of the columns and their type(checkboxes,comboboxes) that i specified on designtime! It's like changing the datasource is generating again the datagridview, why ? and How can I change the datasource without losing these information ? on form load i do something like
Private Sub frmGrid_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Path as string
[Code].....
Change Box Color In Datagridview?
Aug 9, 2010i have to do a system that will trigger an alert. i need to change the color of the box in datagrid view to certain color, according to it's condition.
as example, the first alert will be trigger if there is any values that are below 5. so all box in the datagridview that contains value less than 5 will change to red color.
Change Data In Datagridview
Mar 2, 2009I wrote some code that displays 2 columns of the table "gebruiker" in a sql 2000 database called "TST".But if I change something in the Datagridview it isnt passed trough to the database.What do I have to add in my code so that it does?[code]
View 1 RepliesChange The Row Color In Datagridview?
Mar 12, 2011When I bind the data to Gridview after that i want change the Datagridview content color
View 5 RepliesChange Value In Datagridview Or Datatable?
Jun 21, 2010I'm selecting value from my database, passing it to datatable then giving DataGridView.DataSource value of datatable.The thing is that in those rows i'm also selecting some dates and problem is that my default date in database is '1900-01-01 00:00:00' because i use "smalldatetime". And what i want is this...when I find default value in database i want to show it like an empty string, like i said...because date is in smalldatetime format i can't do this in SQL query so i wonder how can I change this in DataTable or even better in DataGridView...of course, in code?
View 4 RepliesC# - Programmatically Change Selection On DatagridView (.NET)
Feb 22, 2009I've a problem with DataGridView component when trying to set the value of the CurrentCell. What i'm trying to do is :
I've a DataGridView With values. I want to make a button in my forms and when clicking on it I want to change the selection from the current row to the next. To explain more, by clicking my Button I want to simulate the effect of a mouse click on a DataGridview.
Cannot Change Number Format In DataGridView
Nov 30, 2009I have the following code. When I use:
For i = 3 To MaxColumnDataGridView
DataGridView.Columns(i).DefaultCellStyle.NullValue = 0
DataGridView.Columns(i).DefaultCellStyle.Format = "N5"
Next
The columns format can't be changed. I cannot change the number format whatever I do.
Change A Caption On A Tool Tip On A DataGridView?
Jul 26, 2009I cannot get a tool-tip to appear over a DataGridView object, although checking Microsoft's advice, it should do so, as I assume I have a DatSource property NOT set to 'Nothing' for the said DGV. ( I believe this is right, as the columns sort alphabetically, when I click the column headers ! As normal ) If I can get this to work, is there a way to get the underlying data from a Mouse Hover ( Cell Enter ) event, from the cell in question to modify the Tool-Tip's caption ?
View 1 RepliesChange A DataGridView Cell Attributes?
Apr 25, 2012I have a datagridview in which I am dynamically creating the rows and columns. I'm trying to set specific cells font to bold and not sure how to do it!Below is my code and what I'm trying to do.
[Code]...
Change A Datagridview Error Message?
Mar 22, 2011I may have missed the solution to this problem, but in my database I have 2 columns that cannot be null and a system.NoNullAllowedException message is displayed if they are mt. I want to change this message to simply indicate that the cell cannot be null, instead of the huge message with all of the information which is of no use to the user. I cannot seem to find where to change this message. When the exception is thrown I would like to see the message say something like "Empty cell not allowed".
View 19 RepliesChange Backcolor Of Current Row In Datagridview?
Apr 7, 2009I would like to change backcolor of current row in datagridview. Now this thing must work even if i change row trough keyboard, so click event doesn't do the trick for me.The thing is... i would like to accomplish something similar like the code below but on diferent event
Private Sub DataGridView_CellDoubleClick....
Me.DataGridView.CurrentRow.DefaultCellStyle.BackColor = Color.AntiqueWhite
Change Backcolor Of Datagridview ComboBoxColumn?
Aug 11, 2010I have a databound combo box column. When a value in another field starts with an 8, I want to make the combo box read-only and turn the background gray so the user knows it is read-only.
Here is the code I'm using, where am I going wrong? It doesn't change the backcolor to gray.
Private Sub dgvTest_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles dgvTest.CellFormatting
[Code]....
Change Cell Backcolor In A Datagridview
May 15, 2010I would like to change the backcolor of the cell in a row based upon the value of a checkbox in another cell. The value of cell 2 would be a checkbox, so it is either true or false. If it is true, then color the backcolor of just cell 1?
If MyDataGridView.Rows.Count > 1 Then
For Each orow As DataGridViewRow In MyDataGridView.Rows
Console.WriteLine("DK {0}", orow.Index)[code]......
Change Color Of DataGridView Headings?
Jul 26, 2010How do you change the colour of the headings and the record selector. That is forecolor and backcolor?
I want to change it to navy so it blends in with form.
Change Datagridview Column To Combobox VB?
Mar 23, 2012I have generated datagridview column dinamicly by code
DataSet1.Clear()
SqlDataAdapter1.Fill(DataSet1.Tables(0))
DataGridView1.DataSource = DataSet1.Tables(0)
[code].....
Change Datagridview Column Type?
Apr 15, 2012how i can change the text type field of datagridview to datetime pikcer or calender. if i click on edit columns in datagridview i can only see textbox column, combox, and button i want to change the date field in datagridview from text to calender or datetime picker.
View 1 RepliesChange Datagridview Row Colour Depending On Value?
Jul 18, 2012I try to make my datagridview rows change colour depending on value on a row cell. I ve tryed everything i found on the web but nothing..
View 3 RepliesChange Text Of Button In DataGridView?
Jan 13, 2010I have a datagridview (DGV) bound to a table. I am adding an unbound column which is a button. I want to be able to programatically change the text of the button and header between "delete" and "update" depending on selections made by the user. I can't find a way to access the text property to do this.
View 1 RepliesChange The Column In DataGridView From Left To Right?
Nov 27, 2011when I want to select all row in DGV I have to click on the place( I don't know the name of it)where it show a black arrow on the left.Can change this place from left to right.
View 2 RepliesChange The Column Order Of A Datagridview?
Jul 16, 2009How do i change the column order of a datagridview in code.
View 1 Replies