How Can I Achieve Fast Bulk Inserts into an Access Database Using .NET/C#?

Writing Large Number of Records (Bulk Insert) to Access in .NET/C#

Problem: Inserting a large dataset into an Access database using ADO.NET is time-consuming.

Solution:

Using DAO offers significant speed advantages over ADO.NET for bulk inserts into Access:

1. DAO Using Field Variables (2.8 Seconds):

DAO.Field[] myFields = new DAO.Field[20];
for (int k = 0; k < 20; k++) myFields[k] = rs.Fields["Field" + (k + 1).ToString()];

for (int i = 0; i < 100000; i++)
{
    rs.AddNew();
    for (int k = 0; k < 20; k++)
    {
        myFields[k].Value = i + k;
    }
    rs.Update();
}

2. DAO Using Column Index (11.0 Seconds):

for (int i = 0; i < 100000; i++)
{
    rs.AddNew();
    for (int k = 0; k < 20; k++)
    {
        rs.Fields[k].Value = i + k;
    }
    rs.Update();
}

3. DAO Using Column Name (17.0 Seconds):

for (int i = 0; i < 100000; i++)
{
    rs.AddNew();
    for (int k = 0; k < 20; k++)
    {
        rs.Fields["Field" + (k + 1).ToString()].Value = i + k;
    }
    rs.Update();
}

4. ADO.NET Using INSERT Statements (79.0 Seconds):

for (int i = 0; i < 100000; i++)
{
    StringBuilder insertSQL = new StringBuilder("INSERT INTO TEMP (")
        .Append(names)
        .Append(") VALUES (");

    for (int k = 0; k < 19; k++)
    {
        insertSQL.Append(i + k).Append(",");
    }
    insertSQL.Append(i + 19).Append(")");
    cmd.CommandText = insertSQL.ToString();
    cmd.ExecuteNonQuery();
}

5. ADO.NET Using DataTable and DataAdapter (86.0 Seconds):

for (int i = 0; i < 100000; i++)
{
    DataRow dr = dt.NewRow();
    for (int k = 0; k < 20; k++)
    {
        dr["Field" + (k + 1).ToString()] = i + k;
    }
    dt.Rows.Add(dr);
}
da.Update(dt);

6. Text File with Automation Import (2.8 Seconds):

Export data to a text file and use Access Automation to import it (not recommended for large datasets):

StreamWriter sw = new StreamWriter(Properties.Settings.Default.TEMPPathLocation);

for (int i = 0; i < 100000; i++)
{
    for (int k = 0; k < 19; k++)
    {
        sw.Write(i + k);
        sw.Write(",");
    }
    sw.WriteLine(i + 19);
}
sw.Close();

ACCESS.Application accApplication = new ACCESS.Application();
accApplication.OpenCurrentDatabase(databaseName, false, "");
accApplication.DoCmd.RunSQL("DELETE FROM TEMP");
accApplication.DoCmd.TransferText(TransferType: ACCESS.AcTextTransferType.acImportDelim,
    TableName: "TEMP",
    FileName: Properties.Settings.Default.TEMPPathLocation,
    HasFieldNames: true);
accApplication.CloseCurrentDatabase();
accApplication.Quit();
accApplication = null;

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