保存文件的步骤为：
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关闭流，特别是写入流
关闭并保存文件
示例代码如下：
Imports System.Windows.Forms
Imports System.IO
Imports System.Text
Sub SaveFileDemo()
'打开文件。如果文件不存在则创建新的文件
Dim myFile As New IO.FileStream("d:\data.txt", _
FileMode.OpenOrCreate, _
FileAccess.Write)
'在文件末尾添加一行
Dim tw As New StreamWriter(myFile)
myFile.Seek(0, SeekOrigin.End)
tw.WriteLine("白刃格斗英雄连英模部队方队亮相阅兵")
'关闭流
tw.Close()
'关闭文件并保存文件
myFile.Close()
End Sub
Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
SaveSetting("appname", "Startup", "text1", TextBox1.Text)
SaveSetting("appname", "Startup", "text2", TextBox2.Text)
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim text1 As Double
Dim text2 As Double
text1 = GetSetting("appname", "startup", "text1", 8)
text2 = GetSetting("appname", "Startup", "text2", 6)
TextBox1.Text = text1
TextBox2.Text = text2
End Sub
都是用SQL语句完成的
写入数据库
strSQL="INTO TABLENAME （OPTION1,OPTIN2）VALUES(VALUE1,VALUE2)";
cmd.Connection = conn;
cmd.CommandText = strSQL;
cmd.Parameters.Add(paramrs[i]);
try
{
conn.Open();
}
catch(Exception ex)
{
throw ex;
}
finally
{
cmd.Parameters.Clear();
cmd.CommandText = null;
cmd.Dispose();
conn.Close();
}
读取值
strSQL ="SELECT OPTION1，OPTION2 FROM TABLENAME";
cmd.CommandText = strSQL;
cmd.Connection = conn;
DataSet ds = new DataSet();
try
{
conn.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
}
catch (Exception ex)
{
throw ex;
}
finally
{
cmd.Dispose();
conn.Close();
}
TextBox2.text = ds.Tables[0].rows[0][0].value.tostring();