private void Form1_Load(object sender, EventArgs e)
{
OleDb.GetOleDbProvidersCompleted += OleDb_GetOleDbProvidersCompleted;
OleDb.ConnectionStringGenerated += OleDb_ConnectionStringGenerated;
OleDb.GetSheetsNameCompleted += OleDb_GetSheetsNameCompleted;
OleDb.ReadDataFinished += OleDb_ReadDataFinished;
OleDb.GetOleDBProviders();
}