I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement to
merge the fields into one, but I want to know if it's possible to do through
the DataTable, DataView or DataGrid that I have already created to display
the data.
This should be easy...right?
-bruce duncan
11  19709 
Hi,
Add a new calculated column to your dataset. Use that column as the
displaymember in the listbox.
Dim dc As DataColumn
'
' Add a new column in clients table which
' is full name.
dc = New DataColumn("Nam e")
dc.DataType = System.Type.Get Type("System.St ring")
dc.Expression = "LastName + ', ' + FirstName"
dsClient.Tables (0).Columns.Add (dc)
Ken
--------------------
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com...
I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement to
merge the fields into one, but I want to know if it's possible to do through
the DataTable, DataView or DataGrid that I have already created to display
the data.
This should be easy...right?
-bruce duncan
Bruce,
You can by adding an extra column to your datastable and use an expression
in the constructor of that. http://msdn.microsoft.com/library/de...ctortopic4.asp
And do than a datatable.accep tchanges to set the rowstates back to unchanged
(This is all direct after that you filled your datatable)
However you can only use this to display and should make probably directly
from it a readonly field in your styles (I never did it this way with a
datagrid, so that should you try). http://msdn.microsoft.com/library/de...donlytopic.asp
I hope this helps?
Cor
Bruce,
Have you tried adding a computed column to your DataTable?
Assuming you have a "firstname" and "lastname" column in your DataTable, you
can define a "fullname" computed column with:
Dim table As DataTable
table.Columns.A dd("fullname", GetType(String) , "lastname + ', ' +
firstname")
For details on what is allowed in the expression, see the
DataColumn.Expr ession help topic.
Hope this helps
Jay
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com... I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement
to
merge the fields into one, but I want to know if it's possible to do
through
the DataTable, DataView or DataGrid that I have already created to display
the data.
This should be easy...right?
-bruce duncan
Ken, dc.DataType = System.Type.Get Type("System.St ring")
Rather then risk a runtime error with a bad string name on Type.GetType, I
normally use the GetType function:
dc.DataType = GetType(System. String)
This way if there was a typo in the type name, then I receive a compile
error, rather then a runtime error.
Otherwise the results are the same...
Just a thought
Jay
"Ken Tucker [MVP]" <vb***@bellsout h.net> wrote in message
news:eA******** ******@TK2MSFTN GP12.phx.gbl... Hi,
Add a new calculated column to your dataset. Use that column as
the
displaymember in the listbox.
Dim dc As DataColumn
'
' Add a new column in clients table which
' is full name.
dc = New DataColumn("Nam e")
dc.DataType = System.Type.Get Type("System.St ring")
dc.Expression = "LastName + ', ' + FirstName"
dsClient.Tables (0).Columns.Add (dc)
Ken
--------------------
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com...
I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement
to
merge the fields into one, but I want to know if it's possible to do
through
the DataTable, DataView or DataGrid that I have already created to display
the data.
This should be easy...right?
-bruce duncan
I should add that the GetType() function/keyword also supports intellisense,
so you can "pick" the desired type.
I will however use Type.GetType when I am reading the type name from the
app.config or other config file...
Just a thought
Jay
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:em******** *****@TK2MSFTNG P12.phx.gbl... Ken, dc.DataType = System.Type.Get Type("System.St ring")
Rather then risk a runtime error with a bad string name on Type.GetType, I
normally use the GetType function:
dc.DataType = GetType(System. String)
This way if there was a typo in the type name, then I receive a compile
error, rather then a runtime error.
Otherwise the results are the same...
Just a thought
Jay
"Ken Tucker [MVP]" <vb***@bellsout h.net> wrote in message
news:eA******** ******@TK2MSFTN GP12.phx.gbl... Hi,
Add a new calculated column to your dataset. Use that column as
the
displaymember in the listbox.
Dim dc As DataColumn
'
' Add a new column in clients table which
' is full name.
dc = New DataColumn("Nam e")
dc.DataType = System.Type.Get Type("System.St ring")
dc.Expression = "LastName + ', ' + FirstName"
dsClient.Tables (0).Columns.Add (dc)
Ken
--------------------
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com...
I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement
to
merge the fields into one, but I want to know if it's possible to do
through
the DataTable, DataView or DataGrid that I have already created to
display
the data.
This should be easy...right?
-bruce duncan
Jay,
Just too your attentition, I have seen that this gave once by somebody
misunderstandin gs. Have you tried adding a computed column to your DataTable?
It was mixed up with DataTable.Compu te. As you know are it not only English
speaking people who visit this newsgroup.
Just to inform.
Cor
Hi,
You are right Type.GetType would be a better choice. Suprised you
get a compile time error. Copied this code from a working project.
Ken
----------------
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
I should add that the GetType() function/keyword also supports intellisense,
so you can "pick" the desired type.
I will however use Type.GetType when I am reading the type name from the
app.config or other config file...
Just a thought
Jay
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:em******** *****@TK2MSFTNG P12.phx.gbl... Ken, dc.DataType = System.Type.Get Type("System.St ring")
Rather then risk a runtime error with a bad string name on Type.GetType, I
normally use the GetType function:
dc.DataType = GetType(System. String)
This way if there was a typo in the type name, then I receive a compile
error, rather then a runtime error.
Otherwise the results are the same...
Just a thought
Jay
"Ken Tucker [MVP]" <vb***@bellsout h.net> wrote in message
news:eA******** ******@TK2MSFTN GP12.phx.gbl... Hi,
Add a new calculated column to your dataset. Use that column as
the
displaymember in the listbox.
Dim dc As DataColumn
'
' Add a new column in clients table which
' is full name.
dc = New DataColumn("Nam e")
dc.DataType = System.Type.Get Type("System.St ring")
dc.Expression = "LastName + ', ' + FirstName"
dsClient.Tables (0).Columns.Add (dc)
Ken
--------------------
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com...
I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL statement
to
merge the fields into one, but I want to know if it's possible to do
through
the DataTable, DataView or DataGrid that I have already created to
display
the data.
This should be easy...right?
-bruce duncan
Cor,
Huh?
"Computed column" & "calculated column" are terms MSDN uses: http://msdn.microsoft.com/library/de...ctorTopic4.asp http://msdn.microsoft.com/library/de...ctortopic5.asp http://msdn.microsoft.com/library/de...ssionTopic.asp
Don't you agree that it is better to use the nomenclature that MS uses in
its books & on MSDN, rather then making up my own words?
Also, the example code itself rather clear that I was refering to a new
column (table.Columns. Add) rather then calling a method (DataTable.Comp ute)!
Hope this helps
Jay
"Cor Ligthert" <no************ @planet.nl> wrote in message
news:uA******** ******@TK2MSFTN GP09.phx.gbl... Jay,
Just too your attentition, I have seen that this gave once by somebody
misunderstandin gs.
Have you tried adding a computed column to your DataTable?
It was mixed up with DataTable.Compu te. As you know are it not only
English speaking people who visit this newsgroup.
Just to inform.
Cor
Ken, You are right Type.GetType would be a better choice.
Err...
Actually I was suggesting that a GetType expression
http://msdn.microsoft.com/library/de...c911_25_41.asp
would be a better choice over Type.GetType.
Your code does not have a compile time error! I was stating if you
miss-typed the type name on a GetType expression you will receive a compile
error, however if you miss type the type name on the parameter to
Type.GetType you will receive a runtime error instead of a compile time
error... As the GetType expression expects an Identifier, where as
Type.GetType expects a String.
Hope this helps
Jay
"Ken Tucker [MVP]" <vb***@bellsout h.net> wrote in message
news:u6******** ******@TK2MSFTN GP12.phx.gbl... Hi,
You are right Type.GetType would be a better choice. Suprised you
get a compile time error. Copied this code from a working project.
Ken
----------------
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
I should add that the GetType() function/keyword also supports
intellisense,
so you can "pick" the desired type.
I will however use Type.GetType when I am reading the type name from the
app.config or other config file...
Just a thought
Jay
"Jay B. Harlow [MVP - Outlook]" <Ja************ @msn.com> wrote in message
news:em******** *****@TK2MSFTNG P12.phx.gbl... Ken, dc.DataType = System.Type.Get Type("System.St ring")
Rather then risk a runtime error with a bad string name on Type.GetType,
I
normally use the GetType function:
dc.DataType = GetType(System. String)
This way if there was a typo in the type name, then I receive a compile
error, rather then a runtime error.
Otherwise the results are the same...
Just a thought
Jay
"Ken Tucker [MVP]" <vb***@bellsout h.net> wrote in message
news:eA******** ******@TK2MSFTN GP12.phx.gbl... Hi,
Add a new calculated column to your dataset. Use that column as
the
displaymember in the listbox.
Dim dc As DataColumn
'
' Add a new column in clients table which
' is full name.
dc = New DataColumn("Nam e")
dc.DataType = System.Type.Get Type("System.St ring")
dc.Expression = "LastName + ', ' + FirstName"
dsClient.Tables (0).Columns.Add (dc)
Ken
--------------------
"Bruce D" <br************ *@hotmail.com> wrote in message
news:11******** *****@corp.supe rnews.com...
I have a DataTable that I need to merge the 'lastname' and 'firstname'
fields to be displayed in a datagrid. I know I can use the SQL
statement
to
merge the fields into one, but I want to know if it's possible to do
through
the DataTable, DataView or DataGrid that I have already created to
display
the data.
This should be easy...right?
-bruce duncan
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