如何增加SQL连接字符串的连接超时？

Question

private void button5_Click(object sender, EventArgs e)
{
    string filepath = textBox2.Text;
    string connectionString_i = string.Format(@"Provider=Microsoft.Jet.OleDb.4.0; Data Source={0};Extended Properties=""Text;HDR=YES;FMT=Delimited""",
Path.GetDirectoryName(filepath));

    using (OleDbConnection connection_i = new OleDbConnection(connectionString_i))
    {
        connection_i.Open();

        OleDbCommand command = new OleDbCommand("Select * FROM [" + Path.GetFileName(filepath) +"]", connection_i);

        using (OleDbDataReader dr = command.ExecuteReader())
        {
            string sqlConnectionString = MyConString;

            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
            {
                SqlBulkCopy bulkInsert = new SqlBulkCopy(sqlConnectionString);
                bulkInsert.DestinationTableName = "Table in SQL DB";
                bulkInsert.WriteToServer(dr);
                MessageBox.Show("Upload to DB Successful!");
            }
        }
        connection_i.Close();
    }
}

现在我想读取包含大数据的文件并插入到SQL表中。问题是SQL连接超时只有30秒。 我想将SQL连接的超时时间增加到大约2或3分钟。

我该怎么做..请帮忙。 我将数据从csv文件上传到SQL db。

感谢。