我正在使用我的项目中的两个表单(Form1& Form2)
在Form1上,要求用户输入用户名(textboxUsername)&密码(textboxPassword)
当用户登录时,Form2会弹出作为他的帐户,在那里他可以看到他的ID,用户名,姓名,姓氏,生日和金钱列。
登录部分:
MessageBox.Show("Data verified!", "", MessageBoxButtons.OK, MessageBoxIcon.Information);
this.Hide();
Form2 frm2 = new Form2("Welcome: " + textBoxUsername.Text, textBoxUsername.Text);
frm2.ShowDialog();
现在在Form2 button1上,用户可以看到他的列:
public class Form2: Form
{
private string currentUserName = string.Empty;
public Form2(string welcome, string UserName)
{
label2.Text = welcome;
currentUserName = UserName;
}
}
private void button1_Click(object sender, EventArgs e)
{
string constring = @"Data Source=V-K\;Initial Catalog=ATMKlientet;Integrated Security=True";
SqlCommand cmdDataBase = new SqlCommand(" select * from Clients where Username=@uname", conDataBase);
cmdDataBase.Parameters.AddWithValue("@uname", currentUserName);
try
{
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = cmdDataBase;
dbdataset = new DataTable();
sda.Fill(dbdataset);
BindingSource bSource = new BindingSource();
bSource.DataSource = dbdataset;
dataGridView1.DataSource = bSource;
sda.Update(dbdataset);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
现在,在Form2中,我想添加一个textBox,登录用户可以在其中键入数值。如果他的Money列是100,当他在textBox中输入50时,Money列应该在数据库中保持50。否则,如果列值为ex.100且用户撤销200,则应生成错误。每当用户在textBox中输入值时,就像减法或撤销一样。
答案 0 :(得分:0)
使用textbox_keydownEvent
textBox1.KeyDown += textBox1_KeyDown;
代码内部的方法:
private void textBox1_KeyDown(object sender, KeyEventArgs e)
{
if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar)) //it will only allow numeric keys
{
e.Handled = true; //it will handle every non-numeric key, and will only allow integers and control keys
}
else
//write your code to what ever you want to do with database or gridview columns
}