Dont know what's the problem with this code. It says connection property not initialized

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C#

private void flowButton3_Click(object sender, EventArgs e)
{
 string pq = "sold";
 try{
  OleDbConnection con = new 
  OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Login App\SmartShop.accdb");

  OleDbCommand update = new OleDbCommand("UPDATE Items SET[status] = '" + pq + "',  WHERE [ItemID] IN (" + String.Join(",", Array.ConvertAll(strarray, z => "'" + z + "'")) + ")");
  con.Open();
  update.ExecuteNonQuery();
  con.Close();
 }
 catch
 {
  throw;
 }
}

Posted 11-May-15 0:09am

Dakota335

Updated 11-May-15 0:18am

Andy Lanng

v2

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3 solutions

Solution 2

The problem is that even you have an opened connection, update object does not know about it nothing...
You should add this line after opening connection:

C#

update.Connection = con;

https://msdn.microsoft.com/en-us/library/system.data.oledb.oledbcommand.connection(v=vs.110).aspx[^]

Posted 11-May-15 0:21am

Kornfeld Eliyahu Peter

Solution 3

You haven't told the OleDbCommand what connection to use.

Try this :

C#

private void flowButton3_Click(object sender, EventArgs e)
{
    string pq = "sold";
    try
    {
        OleDbConnection con = new
        OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Login App\SmartShop.accdb");

        OleDbCommand update = new OleDbCommand("UPDATE Items SET[status] = '" + pq + "',  WHERE [ItemID] IN (" + String.Join(",", Array.ConvertAll(strarray, z => "'" + z + "'")) + ")",con); // see the connection here.
        con.Open();
        update.ExecuteNonQuery();
        con.Close();
    }
    catch
    {
        throw;
    }
}

Posted 11-May-15 0:24am

Andy Lanng

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Aydin Homay · Accepted Answer · 2015-05-11T00:21:00

Yes it is because you didn`t introduce your connection to command object. which means you need to do like this:

C#

string queryString = "SELECT OrderID, CustomerID FROM Orders";
    using (OleDbConnection connection = new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand(queryString, connection);
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            Console.WriteLine(reader.GetInt32(0) + ", " + reader.GetString(1));
        }
        // always call Close when done reading.
        reader.Close();
    }

So, if I want to write your code I prefer the below one:

C#

private void flowButton3_Click(object sender, EventArgs e)
{
 string pq = "sold";
 try{
  OleDbConnection con = new 
  OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\Login App\SmartShop.accdb");
 String update_sql = "UPDATE Items SET[status] = '" + pq + "',  WHERE [ItemID] IN (" + String.Join(",", Array.ConvertAll(strarray, z => "'" + z + "'")) + ")";// see your sql command
  OleDbCommand update = new OleDbCommand(update_sql,con);// see your ADO.net object
  con.Open();
  update.ExecuteNonQuery();
  con.Close();
 }
 
 catch (Exception ex)
 {
//do something in your catch body like the below 
    Console.WriteLine(ex.Message);
 }
 
}

One more update, try to don`t use blank char in Database path and try to use several objects and variables for storage input parameters because they can help you in truck, maintenance and code readability.
For more information read the blow link:
https://msdn.microsoft.com/en-us/library/dw70f090(v=vs.110).aspx[^]
R,
Aydin