在ASP.net中修改用户密码怎么写代码？

protected void UpdateBtn_Click(object sender, EventArgs e)
{
if (NewPwd.Text == "" || ReNewPwd.Text == "")
{
Response.Write("<script language=javascript>alert('新密码不得为空！');</script>");
return;
}
if (NewPwd.Text != ReNewPwd.Text)
{
Response.Write("<script language=javascript>alert('两次输入的密码不同，请重新输入！');</script>");
return;
}
string ConnSql = System.Configuration.ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
SqlConnection Conn = new SqlConnection(ConnSql);
SqlCommand SelectCom = new SqlCommand("select * from userinfo", Conn);
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter();
Conn.Open();
string SecPwd = FormsAuthentication.HashPasswordForStoringInConfigFile(NewPwd.Text, "md5");
string SqlUpdate = "update userinfo set u_password='" + SecPwd + "'" + " where u_name='" + UserNameLab.Text + "'";
da.SelectCommand = SelectCom;
da.Fill(ds,"UserName");
SqlCommand UpdateCom = new SqlCommand(SqlUpdate,Conn);
da.UpdateCommand = UpdateCom;
//执行UpdateCommand
da.UpdateCommand.ExecuteNonQuery();
Conn.Close();
Response.Write("<script language=javascript>alert('密码修改成功，请单击“返回”回到登录面！');</script>");
}

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