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Posted 24 Jan 2003

Simple Database Application - Part 1

, 24 Jan 2003
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Connecting to Database using C# and ADO.NET


Accessing database is pretty simple job using C# and ADO. In this article, the sample gives you the guidelines for a C# programmer which demonstrates how to use ADO.NET objects including ADOCOnnection, ADOCommand, ADODataReader. Microsoft Data Access Technology got changed with the ADO.NET I access database Employee.mdb, which has a table called "Employee". I will add the employee information to the database .

Using the Code

To write a code in ADO you need to use the following at the beginning of your code.

using System;
using System.Drawing;
using System.ComponentModel;
using System.WinForms;
using System.Data.ADO ;
using System.Data ;
using System.Threading ;

Proceeding with the next step, make sure that all of your GUI is in place for adding the data ( all the text boxes and labels , that is pretty simple so I am not going to cover this), Next will will go ahead and get the connection to the database( note the connection to the database should be running on a different thread, so that it will not mess up the GUI. to do this we have to start a thread as shown below.

ThreadStart DBThread = new ThreadStart(ConnectToDatabase) ;
        Thread DB = new Thread(DBThread) ;
        DB.Start() ;

As you can see above we have successfully started the thread, This thread calls the method ConnectToDataBase, let see what this ConnectToDatabase method is all about.

  public void ConnectToDatabase()
      Infobar.Text="Please Wait, Connecting to database...." ;
      string conn=
"Provider=Microsoft.Jet.OLEDB.4.0 ;Data Source=Employee.mdb" ;
      // here we create a new ADOConnection  
      // Object which takes the connection string
        ADOConnection dbConn = new ADOConnection(conn) ;
        //Make a Select Command
        string empStr = "Select id from Employee" ;
        // creates a new ADOCommand object which takes 
        // a string and connection
        ADOCommand sqlCommand =new ADOCommand(empStr,dbConn);
        // finally open the connection to the database
        //now it's time to read some data from the database, 
        //which can be done as shown below.
        ADODataReader reader;
        //Execute the command and get the Data into "reader"
        sqlCommand.Execute(out reader) ;
        int numRecords=0 ;
        //Get the current number of records present in the database.
          numRecords++ ;
        numRecords++ ;
        //update the employee Id textbox with the Number 
        //of records present plus one.
        employeeID.Text = numRecords.ToString() ;
        Infobar.Text="Connected - Now you can Add records";
Hope the above code is not much confusing, It is lot simpler than writing the code in VC++ ADO. now it's time to write a method that actually takes all the parameters from the GUI Form and writes it to the database with the click of a button. for this we will create a button called Add In your InitializeComponents Method the code would look like this
Add.Text = "AddToDatabase";
Add.Click += new System.EventHandler(WriteToDataBase);
This gets as simple as it looks, Actually writing to database is much simpler as shown below in the code.
protected void WriteToDatabase(object sender, System.EventArgs e)


     string conn="Provider=Microsoft.Jet.OLEDB.4.0 ;"+
               "Data Source=Employee.mdb" ;
     // get the connection object and open the connection
     ADOConnection dbConn = new ADOConnection(conn) ;
     //prepare a statement to get all the values from the text boxes.
     string strInsert = "INSERT INTO Employee (employeeID, " +
       "employeeLastName, employeeFirstName, "+
       "employeeAge, employeeSSN) VALUES ( "
       +employeeID.Text+", '"
       +employeeLastName.Text+"' , '"
       +employeeFirstName.Text+"' , "
       +employeeAge.Text+", "

     ADOCommand adoInsert = new ADOCommand(strInsert,DBConn) ;
     //Execute the statement
     adoInsert.ExecuteNonQuery() ;
     Infobar.Text="Data is being Added to Database " ;
     // after adding the data to the database we need to reset all
     //the data from the text boxes or to say clear the fields in the
     // text boxes so that we can add again.
     int iClear=int.Parse(employeeID.Text);
     employeeID.Text=i.ToString() ;
     employeeLastName.Text="" ;
     employeeFirstName.Text="" ;
     employeeAge.Text="" ;
     employeeSSN.Text="" ;
     Infobar.Text="Connected - Now you can Add more records...";
     DBConn.Close() ;
     MessageBox.Show("All fields must be filled.", "Error",

Hope this was helpful. Will write more on how to view the database values and how to delete those values in my coming articles.


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Comments and Discussions

GeneralMy vote of 1 Pin
JaneDoe7-Jun-09 4:25
memberJaneDoe7-Jun-09 4:25 
GeneralMy vote of 2 Pin
Bart1980123430-Nov-08 22:52
memberBart1980123430-Nov-08 22:52 
QuestionStop double login to SQL Server. Pin
A H Khan27-Jun-06 23:06
memberA H Khan27-Jun-06 23:06 
GeneralAccess database from C#.Net via ODBC Pin
Will L Pittenger12-Oct-04 23:46
memberWill L Pittenger12-Oct-04 23:46 
GeneralRe: Access database from C#.Net via ODBC Pin
Shahriar Nour Khondokar30-Mar-10 19:34
memberShahriar Nour Khondokar30-Mar-10 19:34 
Generalerror message Pin
domza27-Sep-04 1:14
memberdomza27-Sep-04 1:14 
GeneralFew more details Pin
Md Saleem Navalur14-Jun-04 1:33
memberMd Saleem Navalur14-Jun-04 1:33 
GeneralError Message Appear Pin
softman20022-Mar-04 0:08
membersoftman20022-Mar-04 0:08 
GeneralRe: Error Message Appear Pin
domza27-Sep-04 1:18
memberdomza27-Sep-04 1:18 
GeneralHave one question to expand upon on this article Pin
michin127-Oct-03 6:33
sussmichin127-Oct-03 6:33 
GeneralRe: Have one question to expand upon on this article Pin
Shahriar Nour Khondokar30-Mar-10 19:39
memberShahriar Nour Khondokar30-Mar-10 19:39 
GeneralNice Article. Neately explained Pin
Dave Marcus25-Jan-03 12:54
memberDave Marcus25-Jan-03 12:54 
GeneralOld version of .NET! Pin
Rickard Andersson25-Jan-03 12:51
memberRickard Andersson25-Jan-03 12:51 
GeneralRe: Old version of .NET! Pin
leppie25-Jan-03 22:08
memberleppie25-Jan-03 22:08 

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