Question

所以在form1中我从我的数据库中选择数据，如果该数据与我在文本框中输入的数据相同，那么它将关闭表单并打开一个新数据。

        con.Open();
        SqlCommand command = new SqlCommand("select 1 from tblLogin where Username = @user and Securityquestion = @securityquestion and Answer = @answer", con);
        command.Parameters.AddWithValue("@user", txtUsername.Text);
        command.Parameters.AddWithValue("@securityqestion", ddlSecurityquestions.Text);
        command.Parameters.AddWithValue("@answer", txtAnswer.Text);

        var value = command.ExecuteScalar();
        con.Close();

        if (Object.Equals(value, 1))
        {
            this.Hide();
            FormLoginWW2 ss = new FormLoginWW2();
            ss.Show();

        FormLoginWW2 objForm2 = new FormLoginWW2();
        objForm2.ShowDialog();
        string ret = objForm2.ReturnedText;
        objForm2.ReturnedText = txtUsername.Text;
        }
        else
        {
            MessageBox.Show("Error");
        }

这是form2。所以我想要的是我在form1中输入的用户名显示在标签内，以便我可以在数据库中更改该用户名的密码。

        public string ReturnedText = "";


        ReturnedText = labelUsername.Text;
        SqlCommand command;
        command = new SqlCommand("select * from tblLogin where Username = @user", con);
        command.Parameters.AddWithValue("@user", labelUsername.Text);

        if (txtPassword.Text == txtConfirmpassword.Text)
        {

            SqlCommand cmd = new SqlCommand("update tblLogin SET Password = @password where Username = @user ", con);

            cmd.Parameters.AddWithValue("@password", txtPassword.Text);

            MessageBox.Show("Success");

            this.Hide();
            FormLogin ss = new FormLogin();
            ss.Show();
        }
        else
        {
            MessageBox.Show("Error.");
        }

Answer 1

in form1

    public string txtsturen
    {
        get { return txtGebruikersnaam.Text; }
    }

//按钮

            FormLoginWW2 frm = new FormLoginWW2();
            frm.txtsturen = txtsturen;
            frm.Show();
            this.Close();

in form2

    public string txtsturen
    {
        set { labelGebruikersnaam.Text = value; }
    }

c＃将从数据库中选择的值从一个表单发送到另一个表单

1 个答案: