在C#中使用OLEDB可以實現對數據的增刪改查操作，以下是一個簡單的例子：

1. 引用System.Data.OleDb命名空間：

using System.Data.OleDb;

2. 創建一個OLEDB連接對象并打開連接：

string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\mydatabase.mdb";
OleDbConnection connection = new OleDbConnection(connectionString);
connection.Open();

3. 創建一個OLEDB命令對象并執行SQL語句來進行數據的增刪改查操作：

// 插入數據
string insertQuery = "INSERT INTO myTable (column1, column2) VALUES ('value1', 'value2')";
OleDbCommand insertCommand = new OleDbCommand(insertQuery, connection);
insertCommand.ExecuteNonQuery();

// 更新數據
string updateQuery = "UPDATE myTable SET column1 = 'new value' WHERE column2 = 'value2'";
OleDbCommand updateCommand = new OleDbCommand(updateQuery, connection);
updateCommand.ExecuteNonQuery();

// 刪除數據
string deleteQuery = "DELETE FROM myTable WHERE column1 = 'value1'";
OleDbCommand deleteCommand = new OleDbCommand(deleteQuery, connection);
deleteCommand.ExecuteNonQuery();

// 查詢數據
string selectQuery = "SELECT * FROM myTable";
OleDbCommand selectCommand = new OleDbCommand(selectQuery, connection);
OleDbDataReader reader = selectCommand.ExecuteReader();
while(reader.Read())
{
    // 讀取數據
}

4. 關閉連接：

connection.Close();

以上是一個簡單的示例，實際應用中需要根據具體情況來編寫更復雜的增刪改查操作。