如何在C＃中使用datagridview更新Access數據庫

Question

我有一個datagridview ，與一個綁定datatable ，並使用DataPropertyName的datagridview只能顯示4列database 。
這就是我將database綁定到datagridview ：

string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings
["FeedLibraryConnectionString"].ConnectionString;
OleDbConnection Connection = new OleDbConnection(StrCon);
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from SelectedFeeds", Connection);
DataTable DTable = new DataTable();
DataA.Fill(DTable);

frm.RationFeedsdataGridView.AutoGenerateColumns = false;

frm.RationFeedsdataGridView.Columns[1].Name = "نام خوراک";
frm.RationFeedsdataGridView.Columns[1].HeaderText = "نام خوراک";
frm.RationFeedsdataGridView.Columns[1].DataPropertyName = "Feed Name / Description";

frm.RationFeedsdataGridView.Columns[2].Name = "مقدار (کیلوگرم)";
frm.RationFeedsdataGridView.Columns[2].HeaderText = "مقدار (کیلوگرم)";
frm.RationFeedsdataGridView.Columns[2].DataPropertyName = "Quantity";

frm.RationFeedsdataGridView.Columns[3].Name = "درصد (خوراک)";
frm.RationFeedsdataGridView.Columns[3].HeaderText = "درصد (خوراک)";
frm.RationFeedsdataGridView.Columns[3].DataPropertyName = "Percent";

frm.RationFeedsdataGridView.DataSource = DTable;

到目前為止沒有錯

現在我想當用戶更改Columns[2]的值時，它的值自動插入（並在更新后）到database我嘗試使用此代碼進行嘗試，但似乎不對，代碼為：

string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings
["FeedLibraryConnectionString"].ConnectionString;
OleDbConnection Connection = new OleDbConnection(StrCon);
OleDbCommand Cmd = new OleDbCommand();
Cmd.Connection = Connection;
double Quantity = Convert.ToDouble(frm.RationFeedsdataGridView.CurrentCell.Value);
string FeedName = frm.RationFeedsdataGridView.CurrentRow.Cells[1].Value.ToString();
Connection.Open();
Cmd.CommandText="Update SelectedFeeds set Quantity=" +Quantity  'Where Feed Name / Description'= FeedName;
Cmd.ExecuteNonQuery();
Connection.Close();

第一個問題是我的CommandText錯誤，我不知道如何解決。 我該怎么辦？

Answer 1

坦克@LarsTech的答案是：

public static void UpdateRationFeeds(Form1 frm)
{
    string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings["FeedLibraryConnectionString"].ConnectionString;
    OleDbConnection Connection = new OleDbConnection(StrCon);
    OleDbCommand Cmd = new OleDbCommand();
    Cmd.Connection = Connection;
    double Quantity = Convert.ToDouble(frm.RationFeedsdataGridView.CurrentCell.Value);
    string FeedName = frm.RationFeedsdataGridView.CurrentRow.Cells[1].Value.ToString();
    Connection.Open();
    Cmd.CommandText = "Update SelectedFeeds set Quantity=@quantity Where SelectedFeeds.[Feed Name]=@feedname";
    Cmd.Parameters.Add("@quantity", OleDbType.Double).Value = Quantity;
    Cmd.Parameters.Add("@feedname", OleDbType.LongVarChar).Value = FeedName;
    Cmd.ExecuteNonQuery();
    Connection.Close();
}