RequiredFieldValidator[^], perhaps.

由于无效使用而插入的布尔值返回true或false，所以这是怎么回事

Insted of void use return a boolean that is true or false so here is how it goes

private bool checkError()
{
    if (txtName.Text == string.Empty)
    {
        WebMsgBox.Show("Please Enter User Name");
        txtName.Focus();
        return false;
    }
    if (txtUserId.Text.Trim() == string.Empty)
    {
        WebMsgBox.Show("Please Enter UserId");
        txtUserId.Focus();
        return false;
    }
    if (txtPasword.Text.Trim() == string.Empty)
    {
        WebMsgBox.Show("Please Enter Password");
        txtPasword.Focus();
        return false;
    }
    else return true;

}

protected void btnSubmit_Click(object sender, EventArgs e)
{
try
{
if(checkError())
{
  SqlConnection con = database.GetConnection();
  SqlCommand com = new SqlCommand("spRegistration", con);
  com.CommandType = CommandType.StoredProcedure;
  com.Parameters.AddWithValue("@Name", txtName.Text);
  com.Parameters.AddWithValue("@UserId", txtUserId.Text);
  com.Parameters.AddWithValue("@Password", txtPasword.Text);
  com.Parameters.AddWithValue("@Date", txtDate.Text);
  com.ExecuteNonQuery();
  WebMsgBox.Show("Accounts Created Successfully");
  clearFields();
 }

}
catch (Exception ex)
{
WebMsgBox.Show("Error Message:" + ex.Message);
}

}

更改错误例程以返回布尔值:

Change your error routine to return a bool:

private bool checkError()
{
    if (txtName.Text == string.Empty)
    {
        WebMsgBox.Show("Please Enter User Name");
        txtName.Focus();
        return true;
    }
    if (txtUserId.Text.Trim() == string.Empty)
    {
        WebMsgBox.Show("Please Enter UserId");
        txtUserId.Focus();
        return true;
    }
    if (txtPasword.Text.Trim() == string.Empty)
    {
        WebMsgBox.Show("Please Enter Password");
        txtPasword.Focus();
        return true;
    }
    return false;
}

然后只需检查返回代码:

Then just check the return code:

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        try
        {
            if (!checkError())
            {
                SqlConnection con = database.GetConnection();
                ....
                clearFields();
            }
        }
        catch (Exception ex)
        {
            WebMsgBox.Show("Error Message:" + ex.Message);
        }
      
    }