Converting The Type To Number In The Datagridview To Covert Type
Feb 15, 2009
i have a column in datagridview composed of numeric as well as aphanumeric. What i want is when the user sorts the column, it will be sorted according to its number value, 1,2,3,4,5,6,7,8,9,10. However it my current module, the program sorts basing the first digit of the column. like 1,10,11,12,2,3,30,31.
i was thinking of converting the type to number so that it will be arrange properly, is this possible in the datagridview to covert type? because i saw only a readonly property celltype? i have also tried casting it in the sql query itself to INT but it did not work.
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Feb 17, 2010
i am getting the xml using readxml method. And then display the data in datagrid. But number type columns comes as string type in the dataset. So when datagrid displays , sortingdatagrid columns is not correct. For example it sorts like this:
Salary
1180
12133
[code]......
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Sep 24, 2009
Dim Button As ToolStripButton = New ToolStripButton
Button.image = Icon.ExtractAssociatedIcon(exefile)
I try that code, and it just throws me the error that type Icon cannot be converted to Image. So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files? Admittedly i don't really know what im doing
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Oct 28, 2009
Dim Button As ToolStripButton = New ToolStripButtonButton.image = Icon.ExtractAssociatedIcon(exefile)I try that code, and it just throws me the error that type Icon cannot be converted to Image.So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files?
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Apr 14, 2006
Is there a way to allow the user to only type in a certain number of characters in a datagridview column? Like a invoice number can only be 1-6 digits long and I want to stop them from typing more than 6 digits.
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Jan 31, 2010
I have a program that calculates commission, but if the commission is nothing then I do not want it to show a zero commission. I want a message box to show a message that there is no commission earned.
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Oct 2, 2009
I'm trying to add data into a datagridview cell but I keep on getting a data type error.[code]Value of type 'Char' cannot be converted to 'System. Windows.Forms.DataGridViewCell'.[quote]
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Apr 16, 2012
I apologize in advance about asking a newbie question. I am a less-than-intermediate programmer who has done most of his work in VB6, and now trying to wrap my mind around the new concepts of the NET languages.In VB 2010, I have a Structure called "Direction", with one data member -- an integer named "Value". It's supposed to represent a value of degrees from 0 to 359.
Public Structure Direction
Private d As Integer
[code].....
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Feb 5, 2011
Using the code
Dim dr As OleDbDataReader
Dim dbconn As New OleDbConnection
dbconn.ConnectionString =
"Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & "C:MyData.mdb"
[code]....
I can extract
ColumnName = Item
ColumnSize = 80
DataType = System.String
But to write a Parameter I need to convert this to
UpDateCmd.Parameters.Add("Item", OleDbType.BSTR, 80).Value
Is there an easier way of converting DataType = System.String to OleDbType.BSTR than having to make a list with Select Case?Or is there a method to find OleDbType.BSTR rather than reading DataType = System.String?I also tried
SchemaTable = dbconn.GetOleDbSchemaTable(System.Data.OleDb.
OleDbSchemaGuid.Columns, New Object() {Nothing, Nothing, "Auction"})
Dim RowCount As Int32
[code]....
But that also returns DataType = System.String.
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Mar 15, 2012
i want to set a default number and you type in a textbox a random number it should tell you whether it's high or low ,and when you typed in the right nmber it a lable should says something like you win .And also how can you change PART of a lable by typing in a text in a DIFFERENT FORM
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Aug 28, 2009
I have in my My.Settings four settings [code] now I want to get the value of the current setting from the My.Settings.SettingName. [code]
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Feb 21, 2009
I an working on image converting program. I need to convert a file that the user selects in an openfiledialog to the following file types in a folder that the user selects:
.ICO
.PNG
.JPEG
.BMP
.GIF
The user will select which type they want to convert the image to.
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Oct 17, 2011
I don't know how to convert the nvarchar value into an int, but that is the way it needs to be set up. I've found other posts about this but I don't know how to use CAST in the INSERT statement I have. All the posts I could find were about converting to int in SELECT statements. I need this statement to change the field @Duration to an int in the database. @Duration is an amount of time. (01:00, 02:00...) They will all get rounded up to the next int value. So if a user enters 0:45, it should be converted to 1. how to get this INSERT to work?
'SQL Insert: Product table
Dim sqlInsertProduct As String = "INSERT INTO Product (ProductName, Status,
CreateDate, ModifyDate, CreateUser,
[Code]....
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Feb 26, 2009
Error converting data type varchar to datetime.rtfI am trying to learn ASP.NET using ASP.NET 1.1 with SQL Server 2000 for the database. I have created a Stored Procedure in SQL Server 2000 and the procedure to execute the Stored Procedure is in ASP.NET 1.1. The problem is that when I try to save a record, the date field returns the above error. I have ried to use the several solutions on the web without getting one to solve the problem.I am attaching the Stored Procedure as well as the ASP.NET code for some advice. I am also attached a word document containing the two procedures.
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Apr 29, 2010
When I try to close my form it gives me the following error; Error converting data type varchar to numeric. I have only one field which is numeric - ProjectID, and when I close this form sometimes this txtProjectID is empty and this calls the error. But if there is a number in the txtProjectID it closes fine.
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Aug 12, 2010
I am getting the error Error converting data type varchar to numeri when trying to save some of the information that is entered in a textbox to my sql server 2005 database. HEre is the code for my insert statement.
'declare your variables
Dim FirstName, LastName, Comments, MRN
Dim sConnString, connection, sSQL [code]......
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Sep 2, 2010
Using Vb.net/SQL Server 2000 updating a row via a gridview/sqldatasource
Stored proc:
@ISTag varchar(10),
@PCISTag varchar(10),
[Code]......
I don't understand where else it could be screwing up. I'd love to be able to keep it to a null value if it is one already, I'm just trying to get it to take anything right now and this is where I'm at.
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Mar 4, 2010
I'm trying to delete the 2 last characters of a string if they are "||". This is my
Dim MyReader As Microsoft.VisualBasic.FileIO.TextFieldParser
MyReader = My.Computer.FileSystem.OpenTextFieldParser(playlist)
Dim TextFields As String() = MyReader.ReadFields()
Dim last As String = TextFields.Last
If last.Substring(last - 2) = "||" Then
last.Remove(last - 2)
End If
But it gave me the following error on the highlighted line:
"The converting from the string to the type Double is not valid."
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Jun 5, 2009
I'm not sure if i titled this question properly or am asking it properly, but here goes.I've got serialized objects (in XML) stored in a database, along with a string/varchar indicating the type.
[Code]...
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Jul 19, 2011
There was a syntax error while converting from one data type to another. [ Expression = -1 ].
This part of the code where the issue starts is here: Do While JVReader.Read()
Here is the
CODE:
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Aug 1, 2011
I wrote my own database handling code (actually, I write T4 text templating files that generate my database code for me) and part of it takes care of converting values from a database (as Objects) to the desired types.
I have been using this generic function successfully:
vb.net
Public Overridable Function ConvertType(Of T)(value As Object) As T
Try
Return If(value IsNot Nothing AndAlso value <> DBNull.Value, DirectCast(value, T), Nothing)
[Code]....
Simple enough, but it doesn't work... The return type of the function is (and must be) T, so I cannot return a Boolean because a Boolean cannot be converted to T!
Well... It can in this case, because I specifically check that T is Boolean, but the compiler doesn't know this so it doesn't allow me to return a Boolean. I cannot cast the boolean to T either.
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Aug 19, 2009
I wrote my own database handling code (actually, I write T4 text templating files that generate my database code for me) and part of it takes care of converting values from a database (as Objects) to the desired types. I have been using this generic function successfully:
vb.net
Public Overridable Function ConvertType(Of T)(value As Object) As T
Try
[code].....
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Aug 26, 2011
I have a DateTime Picker that I have set Format to "Custom" and CustomFormat to "dd/MM/yyyy HH:mm"
When the user changes the date time it all works fine and update the table no problem.
If the user does not change the date time I get the error[code]...
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Jul 2, 2010
I am trying to create stored procedure that gone return varchar value, and that value I need to display in textbox.This is the code for stored procedure:
Create PROCEDURE Status @id_doc int, @Name varchar(50) OUTPUT
AS
select @Name =items.name
from Doc,Items where @id_doc=IDN and doc.IDN=Items.ID
return @Name
This is the code in vb.net where i need to display returned value from procedure in textbox:
Public Sub Current()
Dim dtc As New Data.DataTable
Dim dr As SqlClient.SqlDataReader
[code]....
When I try to execute this code I get this message in exception:
"Conversion failed when converting the varchar value 'Blue color' to data type int."
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Oct 13, 2010
I've come from a Assembler and C/C++ background, so I understand the concept behind reference types versus value types in vb.net. Also, I've read Jon Skeet's article regarding references and value types and I understand all of that. My question is: How can you tell if a given type is a reference type or a value type? Is it simply that all integral types (ints, floats, etc.) are value types and all classes are reference types? (If so, where do strings fall?)
[Code]...
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Apr 27, 2011
I have a sql select statement with something like:
select...
where column in (@Parameter)
In VB code a set parameter.defaultvalue to "65555,67803", But i get an error "Conversion failed when converting the nvarchar value '65555,67803' to data type int."
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Jul 7, 2009
How can i get the number of columns in A DataRow type?
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Nov 15, 2011
im trying to create a program where the user will type in a number then choose the units its in and units it will be converted to from 2 comboboxes. The output should be changing as different units are clicked without a button.
Public Class Convert
Sub Calculate()
Dim Unit1 As Double = (ComboBox1.SelectedItem)
[Code].....
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Oct 10, 2010
i try to update the table but not sucessful. In access database the following fields with datatype as under;
Parameters=text
Value=Number
Units=text
[code].....
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Feb 5, 2009
I'm familiar with programming/scripting.I started playing with Visual Basic when I realized my tech school had it installed on the network computers, and became a bit addicted (within a few days) of the possibilities it contains.I've started writing something basic.. a number guessing game in a Windows Application. The layout may not be optimal/strategically formed, because I'm not familiar with the language yet.[code]...MsgBox("You've got it! The number was: " + Rand, MsgBoxStyle.Information, "Winner!")'This line is highlighted with this message:'Conversion from string "You've got it! The number was: " to type 'Double' is not valid.
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