How to pass same date value in two different masked text boxes in VB.NET?

Question

1.00/5 (2 votes)

See more:

.NET2.0

Hi friends,

I am writing the code in vb.net where I am passing the same value from datagrid control's column in two different masked text boxes which are used for date input.

txtDate.Text = Format(CDate(dtgrdBranch.CurrentRow.Cells(4).Value), "dd/MM/yyyy")
txtColorInDate.Text = Format(CDate(dtgrdBranch.CurrentRow.Cells(4).Value), "dd/MM/yyyy")

Now the scenario is that, txtdate.text works properly and displays date perfectly, but same value while getting passed in the txtcolorindate control gives me "

Object reference not set to an instance of an object.

" (NullReferenceException was unhandled) error.

Please help me. this bug is delaying the work very badly and I couldn't find any solution since more than 7 days.

What I have tried:

I have tried to change the variable name. Also tried to split the value of

dtgrdBranch.CurrentRow.Cells(4).Value

into string array and pass that concatenated string into txtcolorindate masked text box. but the error messages remains same.

Posted 21-Nov-23 1:10am

Member 13706784

Add a Solution

Comments

Richard MacCutchan 21-Nov-23 8:56am

The error message is clear; you are trying to use a variable that has not been initialised to a valid reference. But it is not clear which variable causes the error. If the two lines of code are one after the other as shown above then it must be txtColorInDate. You should check by using the debugger. Although why you did not use the debugger 7 days ago is something of a mystery.

[no name] 21-Nov-23 12:06pm

Retrieve the grid value "once" by storing it in a variable; then use the variable to assign. (My guess is you typed the "second" getter wrong; contrary to what you're showing).

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Answer 1 · 2023-11-21T10:38:00

Solution 2

I'd suggest to get datagridviewcell's value into variable once, then use it.
On the other hand, forget about old VB function CDate. Use proper .Net function: DateTime.TryParse Method (System) | Microsoft Learn[^]

VB.NET

Dim dd As DateTime
If DateTime.TryParse(dtgrdBranch.CurrentRow.Cells(4).Value.ToString(), dd) Then
    txtDate.Text = dd.ToString("dd/MM/yyyy")
    txtColorInDate.Text = dd.ToString("dd/MM/yyyy")
End If

Posted 21-Nov-23 10:38am

Maciej Los

Updated 22-Nov-23 9:37am

v2

Comments

Richard Deeming 22-Nov-23 4:02am

TryParse requires a string, whereas the Value property is an object. :)

Maciej Los 22-Nov-23 15:36pm

Good point. Thank you, Richard.

Member 13706784 23-Nov-23 1:32am

Thank you so much Maciej Los and Richard Deeming.
I have tried this
Dim dd As DateTime
If DateTime.TryParse(dtgrdBranch.CurrentRow.Cells(4).Value.ToString(), dd) Then
txtDate.Text = dd.ToString("dd/MM/yyyy")
txtColorInDate.Text = dd.ToString("dd/MM/yyyy")
End If

But again the same issue I am encountering. txtDate.text shows the value stored in dd whereas txtColorInDate.text throws the same error NullReferenceException was unhandled.

I really can't understand that why the same value is not getting passed in two same kind of masked text box objects.
Please help

Member 13706784 23-Nov-23 1:32am

Thank you so much Maciej Los and Richard Deeming.
I have tried this
Dim dd As DateTime
If DateTime.TryParse(dtgrdBranch.CurrentRow.Cells(4).Value.ToString(), dd) Then
txtDate.Text = dd.ToString("dd/MM/yyyy")
txtColorInDate.Text = dd.ToString("dd/MM/yyyy")
End If

But again the same issue I am encountering. txtDate.text shows the value stored in dd whereas txtColorInDate.text throws the same error NullReferenceException was unhandled.

I really can't understand that why the same value is not getting passed in two same kind of masked text box objects.
Please help