VS 2008 Dinamic Datagridviewcolumn Item - Any Chance A Column Is Set To Be A Textbox Initially?
Aug 28, 2010
I am working with a datagridview. Is there any chance a column is set to be a textbox initially but for example I want the top item to be a combobox??? This should enabled the user to select something of the list but also load in what was selected and saved before... So for example I have a column called Product Name and it has 5 rows 4 of them should appear as textboxes but one top cell should appear as combobox
Data in Table1 is as follows Code-------product--------weight 1-------------Apple----------2.00 2-------------Mango---------3.25 3-------------Banana---------6.50
Then I have Datagridview with three columns same as Code, Product, Weight
I have following codes Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click str = "SELECT desc1,weight FROM master where code =" & Val(DataGridView1.Rows(0).Cells(0).Value) dt = GetTable(str) If dt.Rows.Count > 0 Then DataGridView1.Rows(0).Cells(1).Value = Trim(dt.Rows(0).Item(0)) DataGridView1.Rows(0).Cells(2).Value = Trim(dt.Rows(0).Item(1)) End If End Sub
When I enter 1 in row(0).cells(0) then other two columns fill automatically, but when enter 2 in next row then nothing retreived from database.I think this line should me modified as current row and current column. str = "SELECT desc1,weight FROM master where code =" & Val(DataGridView1.Rows(0).Cells(0).Value)
so I want to go start using System.Reflection to load my dlls from a special folder as I never did this before and thought I should give it a try. now I'm wondering how to do this. below I have my dll code and my form code I need to know how to use the sub from my dll in my form if I use Assembly.LoadFrom
I have a DataSet that contains 1 DataTable, and the DataTable contains only 1 row of data. I want to loop through all columns in that row and say:
Column name = column value
so for example if the column name is FAVORITE_FOOD and the value is pizza, I should display FAVORITE_FOOD = pizza I can get the column name from column.ColumnName and the value from Rows(0).Item(0), but for the life of me I can't put it all together in a simple loop.
Multi-Threading. I have got a simple bit of code that will need to be repeated but with a chance of it overlapping the only complex bit is there will be a varible that will be different each time. so I was wondering if I put it in another Thread and store the varible within the thread code would that achieve what I am looking for? To make it slightly easyier once the thread is started and pulled the Varible in there will be no cross talking between the thread and main app thread (ie no progress reports, no aborts/suspends etc) Nothing will be feeding back on thread completion either, when it ends it ends.
i have a combobox containing countries name and their codes like INDIA:CNT001 then i have a textbox that store the code of country i.e CNT001(fetching from database) Now i want to match that code with the combobox code so that the combobox is set to that item when i click a button. i m using vb.net and sql server as database.
I am doing database coding for the first time. I wanted to get connected to MYSQL database with "Root" as username, "Password" as password , "DBNAME" as database name, "Local Host" as host and Append the contents of a textbox control to MYSQL column. So can anybody please post code bit in VB.Net for doing this task.
I'm trying to make the textbox field active when listbox selecteditems is change so I know I have to but something in the selecteditemchanged action of the listbox, but what?I tried:
Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged TextBox1.Enabled = True End Sub
how can i add item into next column when my first column add to 5 items it will automatically move to next column and continue to add item in 2nd column.
I created a custom datagridview column for a progressbar and included customizable color properties but I can't get them to work right. After compiling, the properties show up correctly in the Edit Columns popup editor, but changing the values has no effectThe designer generated code shows the original values and manually changing them there has the desired effect(I know you're not supposed to, just testing). Here is the code for the column even though I don't think the issue is stemming from any coding errors there.
I have noticed that when iterating DataGridViewColumns, the speed is greatly reduced if the columns are visible.
For Each col As DataGridViewColumn In cData.DataGridView.Columns col.Visible = visible Next
If visible is set to false (and all columns are all currently visible), iterating 264 columns takes around 0.35s, however, if visible is set to true (and all columns are currently invisible), the same process takes around 30s.Does anyone know what would be causing the extra time?Could it something internal to the DataGridView Control?
I created a custom datagridview. In the constructor of that datagridview, I set
Me.AutoGenerateColumns = False
and then, declared and added 4 DatagridViewImageColumns and 140
DatagridViewTextBoxColumns by the code ... Dim dvgCol as New DataGridViewImageColumn
[code]....
But when I add an instance of that datagridview onto a form, in the form.design.vb there are many code defines for each columns and then sometimes adds additional code to create those columns again. Sometime when I delete the datagridview control in the form,that code is not deleted.
I am building an application that contains several DataGridViews that may have 100-20,000 rows displayed with a DataTable as its DataSource.When the user wants to filter a column they right-click the DataGridView Column Header and a ContextMenuStrip shows a small DataGridView that displays all the unique values in that column. I currently get all the unique values using a loop which is slow (shown below).[code]...
I have a datagridview that I am dynamically building columns for, adding them to the datagridview, and then attaching a dataset. The dataset has more than one table. What sort of syntax should I use to specify the datatable column that the DataGridViewColumn needs to look for in the dataset
datasource to gridview.I have to populate gridview by adding footerrow.I have given visibility of footerrow as true.So one error is coming as 'Object not set to an instance of an object'.what may be the reason for this?Actually i need to add data into the Gridview through the FooterRow.After inserting a few records,i need to insert this data into the database.So, i want this Gridview only to insert data into the database.For a particular "FileID", i have many records,thats why i am using Gridview.Is there any other method for this?
I am totally new to VB2008, so please bear with this likely dumb question.
I have seen numerous "my first program" tutorial that show you how to create your form, put controls on it, etc. I can get through those just fine.
However, I am wondering: If I compile a set of subroutines into a .exe, how do I indicate which code/sub to execute initially? I am an old school programmer (remember COBOL?), and we always had a starting point; a set of code execute, that initiated execution of other subroutines, functions, etc.
I have dabbled in VBA for Excel, and MS Access, and even those, you indicate in the interface, and menus you create, that first bit of code that brings up the menu, or perhaps the program's main interface.
Okay I have everything working as it should but when I first start up the data doesn't show up in the datagridview until I enter another record. It seems to be at the End Sub part of the button click Enter Record.This is what I have at form load event.
How do you declare an array when the array is initially empty?? I am taking multiple measurements from a meter that I want to put into an array. How would I declare that?? Here is my code to accept the last measured value.
HTML Dim measResult as string For I as Integer = 1 to 4 measResult = objDevice.gpibRead(i, 30) ''30 is the buffer size Next
How can I set up measResult so it is an array that will hold all of the measurements from the meter?? I have tried Dim measResult() as string, Dim measResult() as String = objDevice.gpibRead(1, 30) but no luck.
In my window application i have taken one combobox field with its collection as "amc", "war" etc. Now in my datagridview this combobox column is display as Textbox column, i want to change it to combobox with the above collection "amc","war". I have retreiving the result in datagrid through sql query, hence in datagrid edit column section we doesnot have that part to change to Combobox column.
in my window application i have taken one combobox column with its collection as "amc", "war" etc.Now in my datagridview this combobox column is display as Textbox column, i want to change it to combobox with the above collection "amc","war".
I have retreiving the result in datagrid through sql query, hence in datagrid edit column section we doesnot have that part to change to Combobox column.
I've got a database that I've been working on for over a year and a half but I've just recently finished the back end to the point of feeling comfortable with starting on a front end.
I am currently using Visual Basic 2008 Express Edition.I want to make a program that will draw 700 random lines on it initially. I tried my code but the lines only appear in the same way such as straight line and diagonal line. Here's my code:
Public Class Form1 Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
I have a checkListBox with items. I want a textbox to contain the items were checked. How can I go about removing it from a textbox if they user unchecks the item?
Private Sub frdList_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles frdList.ItemCheck Dim item As String = frdList.SelectedItem[code].....
The code below is used to check if the application setting, an arraylist is populated or not via the count method.
When running the program fails with error "NullReferenceException was unhandled" as initially the setting (arraylist) will contain no values.In similar circumstances I would declare a new instance of the object or set value to string.empty or check if DBNull.
I know application settings have a save method but to reference/load them one is not needed.I also left the value field in the projects -> settings to be empty.[code]...
