C#

<br />
        string DBPath;<br />
        OleDbConnection DBConnection;<br />
        DataTable SchemaTable;<br />
        DataColumn SchemaColumn;<br />
        DataSet dbSet = new DataSet();<br />
<br />
(blah blah..)<br />
<br />
                DBPath="Provider=Microsoft.Jet.OLEDB.4.0; Data Source = " + openFileDialog1.FileName.ToString();<br />
                DBConnection = new OleDbConnection(DBPath);<br />
                DBConnection.Open();<br />
                //Retrieve schema information about tables.<br />
                //Because tables include tables, views, and other objects,<br />
                //restrict to just TABLE in the Object array of restriction.<br />
                SchemaTable = DBConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new Object[] { null, null, null, "TABLE" });<br />
                lstbox_tables.Items.Clear();<br />
                //List the table name from each row in the schema table.<br />
                for (int i = 0; i < SchemaTable.Rows.Count; i++)//tong so bang<br />
                {                   lstbox_tables.Items.Add(SchemaTable.Rows[i].ItemArray[2].ToString());//itemarray[2] de hien thi ten bang<br />
                }<br />
........something need to be added here from you..My code that was not correct is here:<br />
<br />
            int table_index = lstbox_tables.SelectedIndex; //index of table<br />
<br />
            //int number_of_columns = SchemaTable.Rows[table_index].Table.Rows.Count;//12 number of column in table [index]<br />
            //int number_of_columns = SchemaTable.Rows[table_index].Table.Columns.Count;//9<br />
            //int number_of_columns = SchemaTable.Rows[table_index].Table.DataSet.Tables.Count;<br />
            <br />
            //int number_of_columns = SchemaTable.Rows[table_index].Table.fi<br />
<br />
<br />
            //MessageBox.Show(SchemaTable.Rows[table_index].Table.Rows[2].ItemArray[2].ToString());<br />
            MessageBox.Show(number_of_columns.ToString());<br />
            lstbox_fields.Items.Clear();<br />
            for (int i = 0; i < number_of_columns; i++)<br />
            {<br />
                //lstbox_fields.Items.Add(SchemaTable.Rows[table_index].Table.Rows[number_of_columns].ItemArray[2].ToString());<br />
            }<br />
<br />
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//----<br />
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byte[] myfile = File.ReadAllBytes(path);
SHA1CryptoServiceProvider SHA1 = new SHA1CryptoServiceProvider();
Console.WriteLine(Convert.ToBase64String(SHA1.ComputeHash(myfile)));