小编Est*_*ies的帖子

我需要一些if else部分的帮助.现在,我的代码显示"if row = 0,user not found".但我想循环,如果没有检测到任何东西,继续循环,直到事件发生变化.我如何在这里循环？

string strOleDbConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Project.mdb";
string strSqlStatement = string.Empty;
strSqlStatement = "SELECT * FROM jiahe WHERE [Tag ID] = '" + txt + "'";
OleDbConnection objConnection = new OleDbConnection(strOleDbConnectionString);
OleDbDataAdapter objAdapter = new OleDbDataAdapter(strSqlStatement, objConnection);
DataSet ds = new DataSet();
objAdapter.Fill(ds);

DataTable dt = ds.Tables[0];
dataGridView1.DataSource = dt.DefaultView;

if (dt.Rows.Count == 0)
{
    MessageBox.Show("Not Found. Please register new user.");
    Form2 frm2 = new Form2();
    frm2.Show();
}
else
{
    string strLine = string.Empty;
    string …