NullReferenceException error in Datagrid

[JenC]

Hi,

I am assigning an array to a Datagrid and then formatting it using the
following code:

Dim cs As DataGridTextBoxColumn = New DataGridTextBoxColumn
cs.MappingName = "TestID"
cs.HeaderText = "Test ID"
cs.Alignment = HorizontalAlignment.Center
cs.Width = 50
ts.GridColumnStyles.Add(cs)

cs = New DataGridTextBoxColumn
cs.MappingName = "TestName"
cs.HeaderText = "Test Name"
cs.Alignment = HorizontalAlignment.Left
cs.Width = 75
ts.GridColumnStyles.Add(cs)

Dim cs2 As DataGridBoolColumn = New DataGridBoolColumn
cs2.MappingName = "Selected"
cs2.HeaderText = "Test Bool"
cs2.Width = 75
cs2.TrueValue = "true"
cs2.FalseValue = "false"
ts.GridColumnStyles.Add(cs2)

dgTest.TableStyles.Add(ts)

The first two formatings are fine it is just when I try and format a column
as a DataGridBoolColumn then I get the following error:

"An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

Additional information: Object reference not set to an instance of an object."
Would anyone have any ideas on how I could sort this out?

Any help/advice much appreciated.

Thanks in advance,
J

[Ken Tucker [MVP]]

Hi,

I dont see the problem here. Please Post some more code.

Ken
---------------------
"JenC" <Je**@discussions.microsoft.com> wrote in message
news:95**********************************@microsof t.com...

Hi,

I am assigning an array to a Datagrid and then formatting it using the
following code:

Dim cs As DataGridTextBoxColumn = New DataGridTextBoxColumn
cs.MappingName = "TestID"
cs.HeaderText = "Test ID"
cs.Alignment = HorizontalAlignment.Center
cs.Width = 50
ts.GridColumnStyles.Add(cs)

cs = New DataGridTextBoxColumn
cs.MappingName = "TestName"
cs.HeaderText = "Test Name"
cs.Alignment = HorizontalAlignment.Left
cs.Width = 75
ts.GridColumnStyles.Add(cs)

Dim cs2 As DataGridBoolColumn = New DataGridBoolColumn
cs2.MappingName = "Selected"
cs2.HeaderText = "Test Bool"
cs2.Width = 75
cs2.TrueValue = "true"
cs2.FalseValue = "false"
ts.GridColumnStyles.Add(cs2)

dgTest.TableStyles.Add(ts)

The first two formatings are fine it is just when I try and format a
column
as a DataGridBoolColumn then I get the following error:

"An unhandled exception of type 'System.NullReferenceException' occurred
in
system.windows.forms.dll

Additional information: Object reference not set to an instance of an
object."
Would anyone have any ideas on how I could sort this out?

Any help/advice much appreciated.

Thanks in advance,
J

[Phil G.]

Hi Jen,

A stab in the dark here! Is it possible that the Boolean values are looking
for 1 & 0 instead of the strings "True" & "False"??

Rgds, Phil

"JenC" <Je**@discussions.microsoft.com> wrote in message
news:95**********************************@microsof t.com...

Hi,

I am assigning an array to a Datagrid and then formatting it using the
following code:

Dim cs As DataGridTextBoxColumn = New DataGridTextBoxColumn
cs.MappingName = "TestID"
cs.HeaderText = "Test ID"
cs.Alignment = HorizontalAlignment.Center
cs.Width = 50
ts.GridColumnStyles.Add(cs)

cs = New DataGridTextBoxColumn
cs.MappingName = "TestName"
cs.HeaderText = "Test Name"
cs.Alignment = HorizontalAlignment.Left
cs.Width = 75
ts.GridColumnStyles.Add(cs)

Dim cs2 As DataGridBoolColumn = New DataGridBoolColumn
cs2.MappingName = "Selected"
cs2.HeaderText = "Test Bool"
cs2.Width = 75
cs2.TrueValue = "true"
cs2.FalseValue = "false"
ts.GridColumnStyles.Add(cs2)

dgTest.TableStyles.Add(ts)

The first two formatings are fine it is just when I try and format a
column
as a DataGridBoolColumn then I get the following error:

"An unhandled exception of type 'System.NullReferenceException' occurred
in
system.windows.forms.dll

Additional information: Object reference not set to an instance of an
object."
Would anyone have any ideas on how I could sort this out?

Any help/advice much appreciated.

Thanks in advance,
J

[Cor Ligthert [MVP]]

JenC,

cs2.TrueValue = "true"
cs2.FalseValue = "false"

http://msdn.microsoft.com/library/de...valuetopic.asp

true en false

I hope this helps,

Cor