db connection

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how to insert data from c sharp to ms access..
i tried but i yet some errors.. can anyone help me. this is my code

<pre lang="cs">private void button1_Click(object sender, EventArgs e)
       {

           try
           {
 OleDbConnection con = new OleDbConnection("provider=Microsoft.Jet.OLEDB.4.0;Data Source='C:/Documents and Settings/Spartanspears/My Documents/Visual Studio 2005/Projects/room/ms access/Room_mgmt.mdb'");
                con.Open();

               // OleDbCommand comm = new OleDbCommand("Insert into individual_expenses(karthi,amount,deta) VALUES('"+cmbBox1.Text+"','"+txtBox1.Text+"','"+txtBox2.Text+"','"+txtBox3.Text+"')");
                OleDbCommand comm = new OleDbCommand("Insert into individual_expenses(karthi,amount,deta) VALUES(' name',' gjhjhgjh','55',' 44')");
                comm.ExecuteNonQuery();
            } 
            catch(Exception ex)
            {
                    MessageBox.Show(ex.ToString());
                }
            }

I got this error "execute nonquery: connection property is initialized"

Posted 26-Sep-10 10:24am

sencsk

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shakil0304003 · Answer 1 · 2010-09-27T05:01:00

An example:

using System.Data.OleDb;

OleDbConnection myConnection = new OleDbConnection();
OleDbCommand myCommand = new OleDbCommand();
string connectionString = ConfigurationManager.ConnectionStrings["DataBase"].ConnectionString;
string query = "";
myConnection.ConnectionString = connectionString;
myConnection.Open();
myCommand.Connection = myConnection;

query = "insert into Solution values (" + problems.ID + "," + problems.UserId + "," + problems.ProblemId + "," + problems.ContestId + "," + problems.ResultId + ",'" + problems.time + "','" + problems.FileName + "'," + problems.RequireTime + ");";
myCommand.CommandText = query;
myCommand.ExecuteNonQuery();
myConnection.Close();

DaveAuld · Answer 2 · 2010-09-26T10:38:00

Have a look at your query.

You are inserting 4 Values into 3 Columns.

Also, the command object does not know which connection to use, so you need to append the connection object to the command object. e.g.
command = new OleDbCommand("some command text", connection)

See this article for a step by step;
http://www.codeproject.com/KB/database/simpledbreadwrite.asp[^]

Abhishek Sur · Answer 3 · 2010-09-26T12:01:00

Solution 2

You might also go for OpenRowSet transact SQL to do this :

http://msdn.microsoft.com/en-us/library/ms190312.aspx[^]

:rose:

Posted 26-Sep-10 12:01pm

Abhishek Sur

db connection

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