Null value for a checkbox in a DataGridView

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Hi,

i have a DataGridView which i have manually coded into the form, and cells 4,5,7,8,9 are checkbox fields, and i need 3 answers for the checkboxes so that when the DGV is loaded it is 'null' and then the user inputs true or false. is there a way to do this? as if i put anything other than 'true' or 'false' i get an error, i have tried to put 'Indeterminate' but that still throws an error.

C#

TMSScoreSheet.Rows[0].Cells[4].Value = "Indeterminate";
TMSScoreSheet.Rows[0].Cells[5].Value = "False";
TMSScoreSheet.Rows[0].Cells[7].Value = "False";
TMSScoreSheet.Rows[0].Cells[8].Value = "False";
TMSScoreSheet.Rows[0].Cells[9].Value = "False";

Billy

Posted 27-Feb-12 4:54am

BunkerBilly

Updated 27-Feb-12 5:50am

Shahin Khorshidnia

v2

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Comments

Dean Oliver 27-Feb-12 11:02am

a checkbox takes a boolean value which can only be true or false. I think rather change your approach.

BunkerBilly 27-Feb-12 11:13am

but a normal checkbox can have 3 check states? are they not the same as the values?

Shahin Khorshidnia 27-Feb-12 11:44am

Please tag your question. WinForm? WPF? ...?

Please!
Please!
Please!

BunkerBilly 27-Feb-12 11:48am

its WinForm, i used the

<pre lang="c#"> bool? b = null</pre>

and set the checkbox to b and it worked great, thanks shahin

Shahin Khorshidnia 27-Feb-12 11:50am

You're Welcome.

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Shahin Khorshidnia · Accepted Answer · 2012-02-27T05:21:00

Hello

Use Nullable type in C#

C#

bool? b = null;

See:

http://msdn.microsoft.com/en-us/library/1t3y8s4s(v=vs.80).aspx[^]

And for your CheckBox, if your application is WPF, try this:

http://wpf.2000things.com/2011/07/29/353-binding-a-three-state-checkbox-to-a-nullable-bool/[^]

If WinForm:

http://stackoverflow.com/questions/8401974/what-is-best-way-to-bind-to-tri-state-checkbox[^]

Or

http://social.msdn.microsoft.com/Forums/en/winforms/thread/c8fb99ad-d9a8-40dd-9a9d-a1f598a9a92e[^]