when i run my program and put Jamie in textbox 1 i get the erros Column 'Jamie'.and the line below is highleighted with that erros
Code:
Dim sqlResults As SqlClient.SqlDataReader = _
sqlStatement.ExecuteReader()
here is the code for that sub
Code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
libraryDB.Open()
Dim sqlStatement As New SqlClient.SqlCommand( _
[code].....
I have a datagridview and has two columns(UserName and Age), what want to do is to get the UserName that has lowest Age.
View 2 RepliesI have a datagridview which is populated from a datatable. This works fine. But if i run it more then once i get a column name "example" already belongs to this datatable. Ive tried everything to clear all the columns of the datatable and the gridview but still the same
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I need to do a lookup in a DatagridView column. I would like something with the blazing speed of what recordset.seek used to provide. I am assuming that a similar function/method is available for use with the DVG. What else is there to use that is better than my present implementation.
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I have a DataGridView binded to a DataSet that I created using the Visual Studio Data Source Configuration Wizard. Everything works good except for one problem.I have two columns, Modified_By and Date_Modified that should be inserted or updated as the user and the current date, respectively. So every row in the DataGridView should have the same value for these two columns.So far, I have thought of two ways to get this working, but neither one seems very clean. The first idea is to make a custom Fill method that takes as parameters the user and the current date and then add them as extra columns in the select method. For example
View 1 RepliesI'm using VS2005 - Vb.net and connection to DB Ms Acceess. I type to one of Column in DB by number and binding it with TextBox.Text. As I know the properties of TextBox must be a Value not Text to match with that Column. But there is no Value Property.
View 3 RepliesI'm just a frustrated noob trying to get past my first DB Program. My goal is to get relational data from different tables all ordered by a certain field..Ive noticed early on that i cannot select a column when its name has a space.[code]Now the statement i want to use is sql = "SELECT [PT.Chart Number],[PT.Last Name],[CA.Case Number] FROM Table1 AS PT INNER JOIN Table2 AS CA ON PT.Chart Number = CA.Chart Number ORDER BY PT.Chart Number"..When i Debug i get the same type of error ("... Can't find column name PT.Chart... ")I'm new to sql so i dont know if my syntax is off.
View 4 RepliesI'm using vb2005. I'm writing a little application which allows a person to type in a new value in a combobox (which I've bound to a field in a table) which can be updated to the database. I then refresh the dataAdapter by clearing it and re-filling it again when the user saves a new item. That part works fine. My problem occurs when the user selects a stationary item from the combobox. The first select works fine until they try to select another item. Then I get the following error: ConstraintException was unhandled: Column 'TYPE' is constrained to be unique. Value 'False' is already present.
View 2 RepliesI have a datagrid that I am populating from an Access 2000 query in Visual Basic 2008.
This code works fine:
With dgvCollections
.Columns(0).Visible = False
.Columns(1).Width = 235
.Columns(2).Width = 230
.Columns(3).Width = 220
.Columns(4).Width = 70
.Columns(4).HeaderText = "Loan"
End With
The query works fine, except that I want to change the alignment for one of the columns. I tried to add this line before the "End With":
.Columns(4).DefaultCellStyle.Alignment.MiddleCenter()
Which causes the error:
"Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated."
And this error:
"Expression is not a method."
I had a DataGridView that was bound to a Table in my typed DataSet. I recentyl added a new column to the table in the database and updated the table in the DataSet accordingly.Now, when I go to the DataGridView to update it, the new column does not appear under the "Databound column" list. I tried setting the data source to "None", then reselecting it. Still, it does not show the new column. I then deleted the DataGridView and re-added it to the form. Again, same result. However, when I select the data source, then click "Preview Data", it show the added column.
View 2 RepliesI have a datagridview with a checkbox column. I'm trying to update data in the dataset but I keep getting this error: Conversion from string "ExtendDate" to type 'Integer' is not valid.The parameter type for ExtendDate is boolean but i'm not sure if that's the correct type.
Code:
Dim Col11 As New DataGridViewCheckBoxColumn
With Col11
.DataPropertyName = "ExtendDate"
.HeaderText = "Extend Date"
[code]....
How can I get information what data type a certain column is. (Integer, string, memo,...)
View 1 RepliesI have loaded my database into vb but now i was to have a combo box with a list of everything in one column of my table?
View 3 RepliesI am having trouble Counting the number of rows in a specific column in a datatable.
View 2 RepliesI am trying seek by looping thru a table for the closest match to a search item.
The following code works to a degree. It gets me within say 20 records of the target. I think it works somewhat but it may not be at all.
Code:
Private Sub Find_Item_In_Column(ByVal Search_Field As String)
'Pass a field name to do a string search on
Dim Find_Item As String = InputBox("Enter an Image File Name")
[Code]....
I used the data wizard to establish the connection and I am using VB 2008 Express.
In this case the data field will be a file name and it will be unique. Since the search for string will be a partial of what a file name might be. My expectation is that INCR will match the data row and can then be used to position the TrainImageBindingSource. So far it gets me close, but I am wondering if it is really working at all. I would like to arrive at the closest match (up or down one) found.
Can any one see any glaring errors or point me to an example(s) of similar code snippets?
I'm realy new to this VB & Db programming#..I have two tables, one has the Vendor details, the other has all past and current PO details for each Vendor.[code]This needs to be done befere the 'For Each objDataRow In objDataTable.Rows. As the Dataset values will also populate another check Boxlist for 3rd Party.[code]
View 7 RepliesI'm retooling an app, and condensing my queries down to one, but to do so, I would like to move the columns for better presentation. I am reporting on errors for particlular equipment, and the user may want to get equipment by errors or errors by equipment. Is there any way to change column order?
View 5 RepliesI'm wanting to alter a column in an acces database, to a Random AutoNumber I know how to do it for incremental e.g."ALTER TABLE MyField Counter(1,1)"but how do you do it for a Random Autonumber??
View 10 RepliesTwo quick questions about datagridviews... I have an unbound dgv and I'm trying to do some simple formatting but sadly my .net knowledge is limited at best. I'm trying to make a balance sheet and I need to do two things:
1. How can I set row(d) to sum row(a:c) for each column (for multiple years of financials)
2. Is there anyway to not only make a row readonly, but make in unselectable (to skip totaled rows)?
What iam trying to do is selecting rows on multiple column values. But the statement below doesn't preform like i thought it would...
Code:
Select Distinct Variable From TableName Where (ColumnA Like"%AAA%") And (ColumnA Like"%BBB%")
I have been reading books and the forums for a rew days now trying to work out how to use any control to carry out the following:Basically, I want to display a selection e.g "Club Name" in a combobox (or similar control) and have the ID of that selection in a separate hidden column e.g. "ClubID". This will allow me to easily reference and store the actual "ClubID" in the required record when I save it back to the database.I can not use the "SelectedIndex" property of the control as the combobox is populated from a 'sorted' stored procedure so the "SelectedIndex" does not match the actual index of the selection.
I have found lots of posts saying use the "ListView" control, but none of them actually show examples of how to bind the control to a data control to acheive what I need.What I am after is a turorial showing ADO code (because I want to hard code this to get a better understanding of how it all works) binding a multi-column control to a SQL database.
I have a DataGridView (dgv) on a Windows form (VB.NET) which is bound to a datatable. One of the bound columns is a an ID (Foreign Key) to another datatable. All I want to do is Hide the ID column and populate an unbound column with the Name (ParmName) for the user. I searched the foreign value in the datatable and retrieved the information. I set the Value of the cell in the Datarow. All works well, but does not display. The cell accepts the value...I can even Debug.Print the values to the console. They are there just nothing displaying in DataGridView. Nothing odd about DataGridView. Should be straight forward...
My Code
,
Dim dtParm As DataTable = MyDataSet.tblParameter
Dim dgv As DataGridView = Me.dgvResultNum_DataGrid
[code]....
I want to include an average in a column where the average ignores zero values in a report cell where the column may have
17
19
0
[code].....
I want 16, not 11 so (17 + 19 + 12 + 13 + 19) / 5 not (17 + 19 + 0 + 0 + 12 + 13 + 19) / 7 Something like this if it would work.
=SUM(Fields!fieldname.Value) / Count(iif(Fields!count_cycle_per_hour.Value >= 0,Fields!fieldname.Value,0))
Essentially just average everything in the column NOT a zero?
Would it be possible to search a table, confining to a specific date range based on a date-time column, and get a count of the 10 most used words in a particular var-char column excluding a list of words?All in SQL?Currently I am pulling out the records that match and sorting through the contents outside of SQL, I would think where I can do it directly on the server it would be more efficient.(SQL 2008)
View 4 RepliesHow to add a checkbox column at first column of datagridview including column header?After adding, how to code to "check all" or "uncheck all"?
View 27 RepliesI want to do something like this:
Code:
'create a dataset and a table
Dim ds As New DataSet
[code].....
I have two text files, the first text file has two columns separated by a space (" ") and the second text file only has one column.
The column 1 in text file 1 and text file 2 match albeit in different order, what I'm trying to achieve is for every field in column 1 text file 2 I want to search for column 1 in text file 1 and display the matching column 2 field in column 2 text file 2.
Dim*OpenTextFile*As*String*= IO.Path.Combine("C:Test1.txt")
Dim*OpenTextFile2*As*String*= IO.Path.Combine("C:Test2.txt")
Dim*SaveTextFile*As*String*= IO.Path.Combine("C:Test2.txt")
[code]....
I have a form that when you click a button it begins a query. I want the user to know that they already started a query and they basically need to wait and not hit the button again. To do this I have a list box that has an lbResults.item.add() to it
Code:
Private Sub btnControlKSMS1117Query_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnControlKSMS1117Query.Click
[code]....
Add persistence to multible DataGridView in terms of Hide/Show column and column width
View 1 RepliesVB GridView control will not allow code in the vb code file to access a data column that has its visible property set to false. When it is set to true, the data column can be accessed with no problem. Any suggestions as to how to correct this? I have looked through the documentation, text books, and I have not found anything that gave me any clue as to what the problem could be. I thought that the property was just applied to the column, not that it would remove the column from being accessible.
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