Multi line text go to next line but last st line is empty then go to next line

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my Question is
i use a multi line text box and how to set when typing i press enter then go to next line but if Textbox last line text is empty then go to Next control focus in C# windows Form Application

What I have tried:

C#

if ((!e.Control & e.KeyData == Keys.Return) | (!this.Multiline & (e.KeyCode == Keys.Down | e.KeyCode == Keys.Up)) | e.KeyData == (System.Windows.Forms.Keys.Return | System.Windows.Forms.Keys.Shift))
                {
                    string[] Mylines = this.Lines;

                    if (Mylines[Mylines .Length - 1 ] == string.Empty & this .Multiline == true )
                    {
                        SendKeys.Send("{Tab}");
                    }
                    else
                    {
                    
                    if (this.FindForm() != null)
                    {
                        e.SuppressKeyPress = true;
                        e.Handled = true;
                        this.FindForm().SelectNextControl(this, !(e.Shift || e.KeyCode == Keys.Up), true, true, true);
                        base.OnKeyDown(e);
                    }
                }
            }

Posted 28-Apr-16 0:27am

Kailashkumar Raghvani

Updated 29-Apr-16 3:20am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v2

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2 solutions

Solution 1

Don't use SendKeys. Using key event simulation for UI development is usually considered as abuse; and I agree with that. Your example is just one to justify that.

In your case, just use nextControl.Focus(), because this is what you really want to achieve. Here, nextControl could be a reference to a control member of your form or other control, that is, some fixed control, but it also can find the next control automatically, the next one in the tab order of child controls:
Control.GetNextControl Method (Control, Boolean) (System.Windows.Forms)[^].

—SA

Posted 28-Apr-16 6:35am

Sergey Alexandrovich Kryukov

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Member 9669862 · Accepted Answer · 2016-04-29T03:20:00

this is done easily with uBound function and string.split function..
hope this help. Sample code is here..

'global variable..
dim c as integer=0

'event...

If e.KeyCode = Keys.Enter Then

Dim strin() As String = txt_pres_add.Text.Split(Environment.NewLine)

Dim lastline = txt_pres_add.Text.Split(Environment.NewLine)

Dim ltext As String
ltext = lastline(UBound(strin))
If ltext.Trim.Length = 0 Then
c += 1
Else
c = 0
End If

If c = 2 Then
textbox2.Focus()

c = 0
End If

End If