C#

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public class Form1 : System.Windows.Forms.Form<br />
{<br />
	<br />
public string d = "20"; <br />
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.<br />
.<br />
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private void testing()<br />
{<br />
<br />
dbConnection dbcon = new dbConnection();<br />
dbcon.Connection()<br />
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}<br />
}//end of class Form1<br />
<br />
public class dbConnection <br />
{<br />
public OleDbConnection conn;<br />
public string SQL ; <br />
public OleDbCommand cmd;<br />
public OleDbDataAdapter adpt;   <br />
public DataSet ds; <br />
<br />
public dbConnection()<br />
{<br />
<br />
conn = new System.Data.OleDb.OleDbConnection();<br />
conn.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;" +<br />
"Data source = "+Application.StartupPath +@"\db.mdb";<br />
		<br />
}<br />
<br />
public void Connection()<br />
{<br />
<br />
Form1 ccF = new Form1();<br />
	<br />
SQL = "SELECT * FROM Table WHERE ID <='" + (ccF.d)  + "'"; <br />
cmd = new System.Data.OleDb.OleDbCommand (SQL, conn);<br />
adpt = new System.Data.OleDb.OleDbDataAdapter(cmd);   <br />
ds = new System.Data.DataSet(); <br />
adpt.Fill(ds,"Table ");<br />
<br />
}<br />
<br />
}//end of class dbConnection<br />