No Data Exists For The Row/column
Nov 4, 2009
I am doin a library management project for my college using vb.net and Ms Access as database. I am getting a error No data exists for the row/column. wen i try to select a value in 1st combobox . The first 3 values are working perfectly wen i click on 4th i get error heres da code
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
[CODE].......................
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Sep 3, 2010
Why am I getting this error, I know there is data there, the code I am using is:
Dim iMaxFields As Integer = oDataReader.FieldCount - 1
Do
sLine = ""
For iColCounter = 0 To iMaxFields
sColOutput = oDataReader.Item([iColCounter]).ToString()
sLine = sLine & sColOutput
[Code] .....
Basically I just want these details put into a HTML table.
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Feb 26, 2010
I'm using VB 2008 and accessing my SQL Compact Db using the following code:
mSQLceCMD = New SqlCeCommand
mSQLceCMD.Connection = New SqlCeConnection(mStrConn)
mSQLceCMD.Connection.Open()
mSQLceCMD.CommandText = strSQL
[Code]...
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Sep 13, 2009
I have a windows service which fetches data from various datasources and build a XML file and send it to a webservice. For example first I will get customer details from Oracle Database and build the XML file and then the SQL Server database and build the customer details XML. I am planning to use the same function below to build the customer object irrespective of what the datasource is. But dr("age") column is not available in SQLserver datbase How can I check if a column exists or not.[code]
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Dec 31, 2009
I want to insert a value from loop in datarow so before entering value in datarow, i want to check that a perticular column NAME exist in table or not...please tell me how can i check it. (vb.net preferred).
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Oct 15, 2008
I 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
[Code]...
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Nov 14, 2008
I have a function in VS2008 VB.NET that creates a dataset and reads field values from that were loaded from a SQL Server 2008 database tables. The tables are from varied sources and in some cases particular column/field names are different. Some use a long name; others use a short name. I need to determine whether a short name or a long name is being used.Pseudo code:If row("ShortName") Exists then ReadDataFrom r("ShortName").ToStringElse ReadDataFrom r("LongName").ToStringEnd If
How would I determine if a particular column name exist in a dataset or datarow?
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Jan 22, 2010
I am creating a program which searches saved .htm files for the source codes. I get the source code and do manipulation on the code to pull the values I need into a datagridview.
Is there anyway to search a datagridview column to see if a value exists first, so no duplicate rows of data will be added? I was thinking of making access table and linking the datagridview to it, but i'm not sure how to set the database links up with code (other than the gui), and then still search the column so I don't put in duplicate rows.So far, I have only come up with the way to add the data row by row...
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim IMsku As String
Dim IMskuitna As String
[code].....
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Jan 20, 2010
I'm trying to do an if statement to determine whether a value entered in a text box exists within a column..
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Sep 15, 2011
I have two tables, dt & dtResults.dt contains 3 columns named: vchInstrumentAnalyteID, bintAnalyteCodeID, & vchAnalyteCode dtResults contains several columns including the columns in dt
I want to get vchInstrumentAnalyteID from the first row in dt and test if it exists in the vchInstrumentAnalyteID column in dtResults. If it exists, I want to use that value from dt to filter rows in dtResults and fill all the filtered rows with data from that row in dt. Then loop to the next row in dt.
I have this code, which is close to what I need, but I can't get it working.
' put analyte data in results table
For Each drA As DataRow In dt.Rows
If
[Code]....
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Mar 18, 2012
I have been messing around with this for a little while and I don't know where I am going wrong. No idea why I should be getting an error. Hopefully it is something simple I have over looked. The image shows the error message, the table I am selecting from, and the method that I am calling.
Er.... no data exists*
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Jun 21, 2010
How can i check if some value exists in the data reader
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Sep 8, 2009
I have been on MSDN about this and searched but it's not quite telling me what I'm after. I've extracted a list of file names from an Excel spreadsheet and want to check whether they all exist in a directory which a user can select in a text box. It feels like I'm nearly there with it but currently my listbox is displaying everything, I want it to just show the files that are missing. I'm a beginner so I'm not exactly sure if I'm even telling it to compare the two things properly, I've tried a couple of ways of checking if a file exists but neither seem to work.[code]
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Nov 30, 2010
This is my programs complete code, the only problem is i want to fix the amount of decimal places that show up in my gridview. The problem is if i do this on the asp side the location of the column gets thrown off and the column is duplicated. I figured if i just remade the table on the asp side it would work only problem is if i remove the sql for that particular column the asp side column cannot get data.
Imports System.Data.Sql
Imports System.Data.SqlClient
Imports System.Data
[Code]....
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Apr 6, 2011
I want to merge or import a column of data from one data table created in VB.NET to another data table's 'same-named' column.The destination data table has all the required columns created before hand but the source data table contains one column at a time, whose name is the same as that of one of the columns in destination data table.Whatever coding I have done for the same till now, results in blank rows at starting. The destination data table looks like this:And I want it to be displayed it as:
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Dec 27, 2010
I have a VB.NET WinForms application. While adding a new data source, it is giving "An item with the same already been added" on the Add Data Source wizard form.
The application does not contains any existing data source.
What could possibly be causing this error, and how might I go about resolving it?
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Aug 7, 2010
SQL Server has a Data Type of "Float". Visual Studio has a Data Type of "Decimal". In other words, if I have a variable in a VB.Net app that is defined as a "Decimal" ...can I move that value into a SQL Server Data Table column defined as a "Float"?
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Nov 11, 2009
I have a listview that has data in 4 different columns. It's just a quick phone storing project to keep "tuned up" on my programming.This is what i have to add the data into each column.[code]I need help finding the data in the second, third, and fourth column because that above is just returning the data in the first column.
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Apr 9, 2010
How to add a checkbox column at first column of datagridview including column header?After adding, how to code to "check all" or "uncheck all"?
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Jul 19, 2010
I am using VB.net Express I need to produce a chart so am using MSchart object.I am using the following code to try to add data (2) to column 1 of a series
Me.Reject_Chart.Series(0).Points.AddXY(1, 2)
I do not get an error immediately but then before the form can be refreshed I get a stack overflow.how to I set this data?
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Jun 2, 2011
So I have a text box in a form. The test box needs to take the value entered and insert it into a column within a row in MySQL. I know it's connecting to the MySQL online, I have a message box telling me so upon a successful connection. I'm just having problems adding the value. Here's my code: Public Class frmOptions Dim ServerString As String = "server=db4free.net; Port =3306; user id=dailylogmain; password=XXXXXXX; database=dailylogmain;" Dim SQLConnection As MySqlConnection = New MySqlConnection
Private Sub frmOptions_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]...
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Aug 26, 2009
i am using asp.net.In my gridview control i have a column called "TotalAmount".The total amount in this column is to be calculated.How can i do this?
Like this:-
Col3(TotalAmount)
30
40
30
Total Amount=30+40+30=100?How can i calculate this 100?
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Oct 16, 2009
'search Male
Dim cmdTextName As String = "SELECT isnull(Count(Gender),0) as TotalMale FROM tblStudent WHERE (Gender = Male)"
Dim sqlcmdName As New SqlCommand(cmdTextName, New SqlConnection(GetConnection))
sqlcmdName.Connection.Open()
[code]....
Am trying to count the number of male in my table however when i try to run using this code it pops an error which is "invalid column name Male" what seems to be wrong with my statements?
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Jul 22, 2011
I have a data grid view that contains several columns. The first column is the only column I care about and it contains Result IDs. The view may be filter from time to time. I want to get the Result IDs from all the visible rows and put them into a table variable so I can use ADO.Net to send that table to a SQL Server stored procedure. I currently use a loop (see below). Is there a way to do this quicker without a loop? I'm new to VB.Net and I was hoping .Net would have an impressive method to do the same thing the loop below is doing.
Private Function prvfnc_GetResultIDs(ByVal dgv As DataGridView, ByRef dt As DataTable) As String
Dim rw As DataRow
[Code].....
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Aug 7, 2009
The user enters information into a textbox and I would like to reflect these changes on the database. So say there is a value of 50 in the textbox and the user just deletes this and it is now "". When I try to update the database I receive an error as it expects a type of double. However, simple appending a 0 here when a value of "" is encountered will not work for me as I have a universal function to handle all of my updating needs. How would I go about determining the type of field I am dealing with (int, double, varchar) of the data table which I currently have in memory
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Mar 19, 2010
I am trying to parse a file generated by LGA Tracon that lists the position data for aircraft over a given time frame. The data of interest starts with TRACKING DATA and ends with SST and there are thousands of entries per file. The system generating the file, Common ARTS, is very rigid in its formatting and we can expect the column spacing to be consistent. Here is an image to preserve the exact formatting Here is a reduced text file.
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Dec 21, 2009
As the title says, is it possible, if so then how can I do it
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Jul 19, 2010
I need to add data into a multi-column list, manually, in codes. I am using VB Express 2008. Could someone please hint me on how to do this with the following controls:
The ListBox or the ListView
The Grid (I think it is the DataGridView)
Or anyother simple way of doing the stuff. All I want is simplicity.
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Feb 10, 2009
I am trying to add data to a access datatable column I am using a richttextbox to fill in any data but when i save it to a column in a database and if there are more chars then 255 then i get an error (try to enter more then column lenght) anything under 255 is working fine the column in access = type of 'MEMO' so no limited to 255 it's the hystory to send that is giving me the problem
Dim history_to_send As String
Dim day_to_send As Date
Dim ID_to_send As Integer
[Code]....
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Mar 4, 2011
if you could possibly point me to the right direction, that would be great. i have tried researching about this but found no solution.i have a 2d array which holds student name and 3 grades (eng, maths, science.)student array (24,3)Now, i would like to use the data which is held within the array to create averages.I need a total class average for: maths column, eng column, and science. I also need an overall average for all subjects.the code i have used, so far, brings some odd results.
studentarray(i,1) / count
studentarray(i,2) / count
studentarray(i,3) / count
[code].....
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