C Sharp :: Add Column To Existing MS Database Permanently?

Oct 5, 2013

adding a column in ms access database and update it with a value.Here is my code, it gives an error that says syntax error in field definition.

string myConn = " ";
myConn = "Provider=Microsoft.ACE.OLEDB.12.0;
Data Source=C:/Users/EmployeeAttendanceRegister/EmployeeAttendanceRegister.accdb";
OleDbConnection myCon = new OleDbConnection(myConn);
string myInsert = "ALTER TABLE Attendance ADD COLUMN SignIn" + dateTimePicker1.Value;

[Code] .....

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C Sharp :: Store Values In Variable Permanently Even After Restarting Machine?

Dec 26, 2013

I want to store values permanently in a variable. The same variable should be able to be edited and saved by user, and whatever it is I need the value of the variable from the last time I modified it, like a database. database because i need this to set my connection string of the database.

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C++ :: Column Based Database - Constructing Very Fast Radix Sort

Apr 12, 2014

I'm attempting to build a column based database, and I'm new to C++ (just wanted to play around with building a column base database "for the fun of it"). I want to construct a very fast radix sort, that would allow me to quickly sort groups of columns based on integer values. My general preference is to take up more RAM to get more performance.

I'd like to build the radix sort by allowing 256 "buckets" to drop values in as I'm sorting. This allows me to sort through a group of 4 byte integers in only 4 passes. But assuming I'm trying to sort a large group of values (say 50+ million), I'm not sure what type of container to use for these. Also note I'm pretty unfamiliar with the "standard library", so below are my thoughts:

Vectors:
-Pros: Easy to use, and very fast for sequential and random access inserts / reads
-Cons: If they have to dynamically resize because a given vector wasn't large enough, this can apparently really slow performance. Unless I make another pass over the numbers before I start sorting, I wouldn't know how big to make individual the individual vectors. This means I either have to make them "too big" and waste space, or pay a performance price for either resizing, or scanning data first.

Lists:
-Pros: Seems like I wouldn't have to specify size ahead of time, so I could just easily insert values to a given list. Also, since I don't need random access reads (I'll ready the "0" list sequentially, then the "1" list, etc. they should work fine.
-Cons: I don't really know much about lists, but I'm not sure how easy it is to append a new value to the end of a list. I've read that standard library lists include both "forward" and "backward" pointers, which I don't need. Also, I find it hard to believe that there isn't some time taken up with memory allocation. If I build a list and append x million records in it, is it calling memory allocation routines x million times?

Or maybe there's another container type I should learn?

Again, my goal is to make this "fast", not "memory efficient". But having said that, the fastest way I could think of (use 256 vectors, each sized equal to the total number of members to be sorted) is just too much memory to burn - 256 times a vector big enough to hold millions of elements is too much.

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C Sharp :: Using Textbox To Be Added To Listview Column

Oct 4, 2014

I have 3 columns already made Product, Price, Quantity, - what I want to do is take the textbox's txtName, txtPrice, txtQuantity, and add them to the columns in the right specific places.

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C Sharp :: Add Hyperlink In Gridview Column In Windows Application Developed In C#?

Mar 26, 2013

I am developing windows application using visual studio 2008 and c#.

I have a GRIDVIEW, but I am not sure how to make a specific column of gridview as hyperlink.

For Example: First column of my grid view is Item ID and if user clicks any of the value in this column a new form should open.

Below is the code of my GIRDVIEW

DataSet ds;
        DataSet ds3;
        public void FillGridView(int LotID) {
            clsPurchase obj = new clsPurchase();

[Code] ....

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C Sharp :: Listbox Item Display - How To Add Column From File To Combobox

Oct 4, 2012

How to display the item in listbox,which are selected from three combobox.

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C Sharp :: How To Bind WPF Datagrid Radio-button Column To Entities Class

May 7, 2012

In my WPF application I created a LINQ to SQL entities class. Then I created a partial class and there add code to my entity class. Below is the code of it:

namespace Mynamespace {
    partial class rts_index {
        #region Fields
        /// <summary>
        /// Status:
        /// "Selected" - true, "Unselected" - false.
        /// </summary>
        private bool _is_selected;

[code]....

Then I executed LINQ to SQL. Works perfectly well. Then I bound WPF Datagrid radiobutton column to is_selected property of the partial class. Below is XAML code:

.
.
.
<Window.Resources>
<CollectionViewSource x:Key="rts_indexViewSource" d:DesignSource="{d:DesignInstance my:rts_index, CreateList=True}" />
</Window.Resources>

[code]....

And here I have the problem. When I'm changing the radiobutton status from Unchecked to Checked it doesn't change the value of is_selected property from false to true in the partial class. I don't know why.

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C Sharp :: TreeView To Database Or At Least DataTable

Feb 8, 2014

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C Sharp :: How To Set Database Execute Statement

Dec 21, 2012

How to set execute statement in the end of sql, Attach is my code:

     private void InsertintoDB() {
            string strSQL = "";
            string strDBType = System.Configuration.ConfigurationManager.AppSettings["DBType"];
            string strConn = System.Configuration.ConfigurationManager.AppSettings["DB_CONNECTION_STRING1"].ToString();
            string strInsertTableName_Sql = "CIMMGR.[dbo].ANSDATA";

[Code] ....

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C Sharp :: Updating Database From Datagridview

Jul 12, 2013

I just wanna update my database with one click only.

I do for update my database from datagridview1 but it shows a error like this :

Unhandled exception has occurred in your application . If you click Continue, the application will ignore this error and attempt to continue. If you click Quit,the application will close immediately.

Update requires a valid UpdateCommand when passed DataRow collection with modified rows

Attached Files : WindowsFormsApplication4.zip (127.2 KB)

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C Sharp :: How To Connect With Particular Database File (MDB) While Loading App

Aug 3, 2013

I am developing a win form application with sq l server2005, in client system after install the application I created the folder for storing the database of running application, like that I have every year database separately, My doubt is how to connect the particular year database while loading the app?

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C Sharp :: Browse Database Name And Server To Connect?

Apr 3, 2013

How can i browse database name and server to connect?

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C Sharp :: Increment Value Of Textbox And Save It In Database

Dec 24, 2012

I have a text box invoice no on windows form and i need to retrieve data from database and everytime user click on the add button the invoice no should increment by 1...

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C Sharp :: How To Save To Access Database In Application

Jan 21, 2014

I have application that codes and binds an access database to a windows form application. Everything seems to work however, nothing is actually saved in the database. Updates and deletes are coded and debugging steps through, but checking the db, the data is the same.

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C Sharp :: Add Indexed (Duplicated OK) To Access Database

Jan 31, 2013

I have an application which inserts large amount of data in Access database. So to speed up the things i have set Indexed property to No.

So at the end of insertion i need to set the index to the column of the one of the table to Indexed (Duplicates OK) through C#.

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C Sharp :: How To Store Fingerprints From A Reader Into SQL Database

Mar 11, 2013

I'll work soon on a program that should take the finger print from a reader and save it in sql server to determine employees's presence and leaving. My questions are:

1- Is the written code differ from one reader to another? or any code apply to all readers?

2- I knew that i should take the image and save it in varbinary in sql server, but how i shall take it?

3- Libraries i should use in visual studio 2010 and c#?

4- should i write license with a definite number of fingerprints save?

5- when i try to approve an employee pressece (by taking his fingerprint), shall i go directly to his id in SQL server and compare his fingerprint stored with the new one entered, OR i Should take the fingerPrint and search for it?

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C Sharp :: Program To Update Database Using Datagridview

Feb 22, 2015

I have a program in C#.net. There is a datagridview which shows all the details of the student. Then I add a column to update another column using the value I entered. Means I want to add roll no to student details table while running. I want the code to update it. Is it possible?

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C Sharp :: Images Search From Database Using Sessions

Feb 14, 2013

I am facing a problem which is that when i search image from database then it just shows last image which is stored in the database. My code is

private void Images()  {
            SqlConnection con = new SqlConnection("Data Source=chusman-pc;
Initial Catalog=Hotel_Management;Integrated Security=True");
            con.Open();
            SqlCommand com = new SqlCommand();

[Code] ....

I call this function at SelectedIndexChanged of dropbox..

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C Sharp :: Make Setup With SQL Database In Installshield

Apr 20, 2013

i want make a setup for C# program with SQL data base but i can not . i use installshield but i have error in connection to database in execution program.

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C Sharp :: How To Display Images In Datagridview From Database

Feb 9, 2013

I have patient_table in the database. which contain Id, name ,Image & other fields I have inserted the image in the Byte form in the database.Now i want to display all records in the Datagrid view in windows Form.

i am able to display id & Name & all fields but unable to display the image of a patient in the datagrid view.

I put all the records in the genric list:-

public static List<Personal_Details> AllMembers() {
            List<Personal_Details> listMembers = new List<Personal_Details>();
            Personal_Details pDetails;
            try {
                String Constring = ConnectionString.dataBaseConnectionString;

[code]...

i am unable to write the code for displaying the image on data gridview.

I am unable to find the solution for binding the image field in the datagrid view.

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C Sharp :: How To Retrieve Data From MySQL Database

Jan 17, 2013

i am student working on a project in c# to maintain the datas from a solar battery monitoring.i already imported the datas from the battery monnitoring and saved them in mysql database and retrived the data in c#.

i have problem in retriving the data in accordance with the date and time range selection.

what i am trying to do is there are more than 1000 datas in the table if i select two date and time the datas in the table should cross check these dates and show all the datas in the table in between those date&time

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C Sharp :: Inserting Data Into Database And Display In Gridview

Feb 12, 2014

using System;
using System.Collections.Generic;
using System.ComponentModel;

[Code]....

find the attachment.

Data is displaying in grid view but when i enter the particulars it's not inserting in to DB & grid view.

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C Sharp :: Access Database Is Copying To Output Directory On Its Own

Oct 4, 2014

I have an extremely annoying problem, I am inserting data into an access database and now i have noticed that it is copying itself to the bin/debug folder on ts own and yet i have set "Copy to Output Directory" property to "Copy never"

But without fail, it is copied! It is making any attempted updates to the database's information invalid since its not updating at all.

This all started when i installed crystal reports and it asked me to make a duplicate of the database in order to utilize data-sets that were created for certain reports.

Why this is happening? I cannot test my application properly at all.

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C Sharp :: Winform Installer Error From Database Connection

Aug 20, 2013

I was created winform application with sql data base, after i created it i was converted to the installer file,for the other users but when they run the application did not connect to the database, how i fix this stuff...?

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C Sharp :: Display SQL Database Record In List View Using C#

Oct 6, 2012

I want to display the content of my database in list view. The table has 5 columns however when I tried this code

string view = "Select * from cust_infor";
SqlCommand cmd = new SqlCommand(view,FL.clsconnection.opencon());
            SqlDataReader dr = cmd.ExecuteReader();
            listView1.Items.Clear();
            while (dr.Read()) {
                listView1.Items.Add(dr[0].ToString()).SubItems.Add(dr[1].ToString());
           }

It limits the display to 2 columns. List view will only show the first 2 columns. The code above won't let me add more indexes or subitems. Only up to 2 columns.

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C Sharp :: Crystal Reports - Database Login Prompt

Oct 5, 2012

The report works in my computer. But when I deploy to another computer, it doesn't work. It got login in prompt. I used SqlClient to get data then bind to DataSet, then set report source.

My environment: XP + VS 2003
DataBase : MS SQL 2005 (another server)
System : Windows Form

Client PC : XP

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