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I want an expandable gridview which displays child rows.
I have already implemented it using a parent and child gridviews concept.by having child grid inside itemtemplate column within div tag and display or hide it using javascript function. this affects performance.If i have 20 records displayed it will 20 child gridviews.
can any one tell me a approach which will not affect performance as well as do not postback.
Thanks in advance.
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You're looking for the ASP.NET forum[^].
Youre question has nothing to do with VB.NET at all. But, you may also want to look into third party grid controls if you don't want to put the time into creating your own grid.
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Hi
I am a newbie and need to create a web application to add, update delete employees and also sdo a search on them
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kmathebula wrote: need to create a web application to add, update delete employees and also sdo a search on them
Good, you have my permission to proceed. Was there anything further?
Bob
Ashfield Consultants Ltd
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Google for something like a "Contact Manager" application. That's about as close as you're going to get to what you described. You'll, of course, have to modify it to your own needs.
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Why do I get the feeling that yet another outsourced development project is about to fail?
Bar fomos edo pariyart gedeem, agreo eo dranem abal edyero eyrem kalm kareore
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Hai all
I have a class library and have a class called Basepage.vb in the same project.when i try to call the basepage.vb in my class library it says
ambiuous namespace .. not only a single file,but almost 7 files are in this status.. Please help me..
Thanks in advace
George Mathew
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ambiuous namespace means your application namespace name or any two namespace in your application have the similler name. So try to use the full path of the name space. It will work.
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Let me clear up the other guys explanation.
It means you have the same class name defined in two different namespaces you're importing. You could have given a class in your code the same name as a class that Microsoft wrote in the .NET Framework.
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Hi,
I am working on a project where I need to read and write the database password from external source not from database. For which I am trying to create a file in encrypted format.
The file will have two fields(1. UserName,2. Password)
Any Idea how I can solve this problem?
Thanks In Advance
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I have an application with a main window that shows a gridview of records that can be selected and buttons along the bottom that offer options either updating one of the records or creating a new one. I use the same for for both of these functions I just make cosmetic changes to the title and buttons depending on which function the user chooses. When the user chooses to add a new record to the database a new record is created and loaded into the form. The user may then put whatever data they require into the record then they must then choose to either save the record or cancel out of the form which then deletes the blank record from the database. The only way to close this form is to select one of those options. The problem I am running into is that apparently the users are opening a form to input a new record then becoming distracted by phone calls or other processes and forgetting that they have this form open. When they return to the app they are just closing the main form which of course closes all of it's open forms which then leaves me with blank records in my database.
What I would like to do is to perform a check before I close the main window to see if any other windows have been left open and run through my code to delete the database record before the application completely closes. I can use the FindWindow function to check for the open window on the window closing event of my main window but am at a loss as to how to stop the window from closing until I manage the situation.
Can anyone offer me any suggestions?
Thanks for all your help,
Judy
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In the Form.FormClosing event, you can cancel the closing, i.e.:
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
'If there are are windows open, maybe tell the user and switch to them.
e.Cancel = True
End Sub
Would the "Shutdown mode" option in the project's settings be of any help? Maybe try setting it to "When last form closes."
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Thank you so much JZ! That took care of the problem. I can give the user a message then send the open form to the front so they can close it cleanly.
I'll look into the shutdown mode option on the project also.
Thanks for all the help,
Judy
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Please Help Me - Urgent
How Do I Add A New Column For Each Record From A Table To An Existing DatagridView
I have 3 tables. Each table has a common unique key field linked to the main table.
I want to populate a datagridview with the contents of all the tables.
For each record in the 2 sub tables, i want to add a new column in the datagridview.
TABLE 1 TABLE 2 TABLE 3
Prd Dsc Qty Prd Cat Prd Loc
123 MyProd 10 123 Perishable 123 Fridge 1
123 Fridge 2
123 Fridge 3
DATAGRIDVIEW
Prd Dsc Qty NewCol - Cat NewCol - Loc NewCol - Loc NewCol - Loc
123 MyProd 10 Perishable Fridge 1 Fridge 2 Fridge 3
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Which language? VB, C#? Which version of VS? 7, 8, 9?
If v8 or later You could use a TableAdapter with ClearBeforeFill set to False provided that the primary keys of all tables have as you say "common and unique values"
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I am using VB.Net 2008 with an access database and i am using a TableAdapter to fill the datagrid.
I am new to vb and do not now how to code for this. What i do have so far is that my program is working fine loading the datagridview from a single table. To link to the sub tables and add a column for every row of the sub table is my problem - i do not know how to code it. Here is my code so far:
' Iniatilize Connection
cn = New System.Data.OleDb.OleDbConnection( _
"provider=Microsoft.Jet.OLEDB.4.0; " & _
"data source= " & Directory.GetCurrentDirectory & "\XXXDatabase.mdb")
'Populate Members DataGrid
da = New System.Data.OleDb.OleDbDataAdapter("SELECT * FROM XXXDetails", cn)
ds = New System.Data.DataSet
da.Fill(ds)
DataGridView1.DataSource = ds.Tables(0)
cn.Close()
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Mmm, Don't know why you're doing it in code when you can use the 'visual' designers to accomplish the same thing more easily.
I would do the following:
1 add a new dataset to your project using 'Add New Item'. Choose a name for it, like 'dsProducts'
2 when you can see the new dataset in Solution Explorer, double click it to open the dataset designer.
3. Open Server Explorer and use the wizard to create a new data connection to your access database.
4 Once created you'll be able to navigate in VS to see the tables in the access db.
5 click and drag each of the tables from the server explorer to the dataset designer. This will automatically create the table adapters you need for all the tables.
See if you can get this far, then come back here
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Thankyou, I have now done all 5 steps.
What next?
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OK.
6 In the dataset designer click and select the main table (the one you've already used to fill the datagrid.
7 right-click on the TableAdapter row where it says Fill, GetData and choose 'Configure'
8 When a window appears you'll see the 'SELECT' statement for the query that VS uses to fill the table.
9 Click 'Query Builder' You'll now see a representation of your table showing all the fields in the top pane
10 Right click the top pane and choose 'Add table'. Do this for all the other tables you want to get data from
11 Now you need to link the 'Common ID fields' of all the tables. If you've set the primary keys correctly then these fields will be in bold type. To link the fields, click the key field in the main table and drag and drop it on to the corresponding field in one of the other tables. Repeat the process for the other tables.
12 Now click the check boxes next to the fields that contain the additional data you want to see in the data grid. When you do this you'll see the sql statement change. When you're done, click the OK button to close the Query Designer, then click Finish to close the TableAdapter Configuration window.
13 In the dataset designer, your main table should now contain the additional fields
14 Save the changes and close the dataset designer.
Let me know when you've done the above.
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Forgot to ask... Do you have a one-to-one relationship between the main table and the sub-tables or are the relationships one-to-many, that is, each record in the main table links to more than one record in a sub table?
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I'm not sure what it should be now. In the relationship diagram it says one to one.
There is only one product-id in the main table. In the sub tables, the same product-id can occur many times, but with with different category groups for instance. So essentially, it is a one-to-one relationship.
Don't forget i am trying to prevent multiple records in the main table when i add product categories, because the same product can occur in a number of categories. So the categories will be stored in a separate table with the same product-id. But when i display the datagrid, i want to only display one line per product-id, but with each category in a separate column.
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Mmm... I figured you might have a many-to-one relationship somewhere. Unfortunately the datagridview displays its data on a row-by-row basis so as soon as you assign a datasource it will display the data from the table, row by row. It's possible to show hierarchical data in the datagrid view by having related records appear as part of the main record but not as extra/additional columns. Instead you'll have extra rows beneath the parent row but these rows will be 'contained' within and below the parent row.
If you've managed to do everything I've said in the previous posts then all that's left to do now is to assign the datasource to the datagridview.
Open the form that has the datagridview on it in design view.
Select the datagridview and look at it's top-right corner, you should see a 'smart tag' appear. Click it and use 'Choose Data Source' to navigate to select the main table in your dataset. VS should then set up the data source automatically for you and you should be able to see the records displayed in the grid when you run your app.
To see the datagridview display records hierarchically you need to assign the datagridview's datasource to be the object that represents the relationship between the main table and the sub-table(s).
I wish I could see your tables structure and relationships then I'd be able to advise you better.
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I looked at my database again. Corrected some errors. The sub tables are one-to-many relationships with the main table. It does not look as if what i want to achieve will work. I do not want the datagridview to display more than one record per item.
What i am also doing is exporting my datagrid to excel. Here is the code (It exports the main table perfectly). If you could perhaps help me modify my code to ADD the additional columns from the sub table records to the excel spread sheet, that will also solve my problem because it will be used mainly for pivots and printing.
The vb is merely a front-end for capturing and displaying the data and i thought it would be easy enough to just add the extra columns to the datagridview, because my export to excel already works very well.
Thanks very much for your help so far.
Private Sub btnExport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExport.Click
'Verfying the datagridview has data or not
If ((DataGridView1.Columns.Count = 0) Or (DataGridView1.Rows.Count = 0)) Then
Exit Sub
End If
'Creating dataset to export
ds = New System.Data.DataSet
'Add table to dataset
ds.Tables.Add()
'Add column to the table
For i As Integer = 0 To DataGridView1.ColumnCount - 1
ds.Tables(0).Columns.Add(DataGridView1.Columns(i).HeaderText)
Next
'Add rows to the table
Dim dr1 As DataRow
For i As Integer = 0 To DataGridView1.RowCount - 1
dr1 = ds.Tables(0).NewRow
For j As Integer = 0 To DataGridView1.Columns.Count - 1
dr1(j) = DataGridView1.Rows(i).Cells(j).Value
Next
ds.Tables(0).Rows.Add(dr1)
Next
Dim excel As New Microsoft.Office.Interop.Excel.ApplicationClass
Dim wBook As Microsoft.Office.Interop.Excel.Workbook
Dim wSheet As Microsoft.Office.Interop.Excel.Worksheet
wBook = excel.Workbooks.Add()
wSheet = wBook.ActiveSheet()
Dim dt As System.Data.DataTable = ds.Tables(0)
Dim dc As System.Data.DataColumn
Dim dr As System.Data.DataRow
Dim colIndex As Integer = 0
Dim rowIndex As Integer = 0
For Each dc In dt.Columns
colIndex = colIndex + 1
excel.Cells(1, colIndex) = dc.ColumnName
Next
For Each dr In dt.Rows
rowIndex = rowIndex + 1
colIndex = 0
For Each dc In dt.Columns
colIndex = colIndex + 1
excel.Cells(rowIndex + 1, colIndex) = dr(dc.ColumnName)
Next
Next
wSheet.Columns.AutoFit()
Dim strFileName As String = "C:\AAA\MemberList.xls" 'This will become a textbox later
Dim blnFileOpen As Boolean = False
Try
Dim fileTemp As System.IO.FileStream = System.IO.File.OpenWrite(strFileName)
fileTemp.Close()
Catch ex As Exception
blnFileOpen = False
End Try
If System.IO.File.Exists(strFileName) Then
System.IO.File.Delete(strFileName)
End If
wBook.SaveAs(strFileName)
excel.Workbooks.Open(strFileName)
excel.Visible = True
End Sub
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You still end up with the same problem, trying to convert row data into column data and matching it to the main table data.
What version of MS Access are you using for your database?
If it's 2003 or later then one course of action could be to create a Crosstab Query in MS Access for each of the tables that need the data rows converting into columns. You could then create a new Select Query to combine the data from the main table with that from the crosstab queries and then reference the Select query in your vb.net app instead of the main table. You would then not need to change your code to export to Excel.
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please help...
how can i open or activate window to launch excel using vb.net??
thanks...
jyn
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