Primary Key in DataGrid

Ryan Riddell

I am using the DataGrid control from 4guys (http://aspnet.4guysfromrolla.com/dem...hlighter.aspx). I want to display 2 columns and allow editing. The only column I want the user to be able to change is the second column. I made this work via ReadOnly="true" for the first column.

The second requirement is that the grid stores 2 table primary key values in columns 3 and 4. These columns will mean nothing to the user and could potentially confuse them. For this reason I need to hide the columns. So in the DataGrid definition on the .aspx page I added:

<asp:BoundColum n DataField="Prod uctId" Visible="false" ></asp:BoundColumn >
<asp:BoundColum n DataField="Cust omerId" Visible="false" ></asp:BoundColumn >

Then in the update command I simply Response.Write out the values for now:
Dim s1 As String = e.Item.Cells(1) .Text
Dim s2 As String = CType(e.Item.Ce lls(2).Controls (0), TextBox).Text
Dim s3 As String = e.Item.Cells(3) .Text
Response.Write( s1 + "__" + s2 + "::" + s3)

Doing this yields:
[correctColumn1]__[correctColumn2]:: <-s3 is blank

How do I get the values in the hidden third and fourth columns?

Thanks,
Ryan

Nov 18 '05 #1

Subscribe Reply

2375

Ersin Gençtürk

Hi ryan,

I would suggest you to use DataKeyField property of the datagrid column.So
you won't need to hide columns etc.

You can use it like this to get key field :
//int x = row number;

object DatabaseKey=grd List.DataKeys[x];
dsListe.ElisteU runRow
ElisteUrunRow=( dsListe.ElisteU runRow)TempElis te.Rows.Find(Da tabaseKey);

"Ryan Riddell" <Ry*********@di scussions.micro soft.com> wrote in message
news:20******** *************** ***********@mic rosoft.com...

I am using the DataGrid control from 4guys (http://aspnet.4guysfromrolla.com/dem...hlighter.aspx). I want to
display 2 columns and allow editing. The only column I want the user to be
able to change is the second column. I made this work via ReadOnly="true"
for the first column.
The second requirement is that the grid stores 2 table primary key values in columns 3 and 4. These columns will mean nothing to the user and could
potentially confuse them. For this reason I need to hide the columns. So
in the DataGrid definition on the .aspx page I added:
<asp:BoundColum n DataField="Prod uctId" Visible="false" ></asp:BoundColumn >
<asp:BoundColum n DataField="Cust omerId" Visible="false" ></asp:BoundColumn >

Then in the update command I simply Response.Write out the values for now:
Dim s1 As String = e.Item.Cells(1) .Text
Dim s2 As String = CType(e.Item.Ce lls(2).Controls (0), TextBox).Text
Dim s3 As String = e.Item.Cells(3) .Text
Response.Write( s1 + "__" + s2 + "::" + s3)

Doing this yields:
[correctColumn1]__[correctColumn2]:: <-s3 is blank

How do I get the values in the hidden third and fourth columns?

Thanks,
Ryan

Nov 18 '05 #2

Ersin Gençtürk

why my method didn't work ? did you tried it well ?
anyway , it is the suggested way to get primary keys from the datagrid.I
think you should try it again.

regards

"Ryan Riddell" <Ry*********@di scussions.micro soft.com> wrote in message
news:7F******** *************** ***********@mic rosoft.com...

Neither method worked for me.

Instead I defined a style in the sheet.
<head>
<style type="text/css">
.hidden
{
display: none;
}
</style>
</head>

Then I statically defined the columns and set the itemstyle and headerstyle CssClass attribute to "hidden".
<Columns>
<asp:EditComman dColumn ButtonType="Lin kButton" UpdateText="Upd ate" CancelText="Can cel" EditText="Edit" /> <asp:BoundColum n DataField="Prod uct" HeaderText="Pro duct" ReadOnly="true" >
<ItemStyle Font-Bold="True" />
</asp:BoundColumn >
<asp:BoundColum n DataField="Rang e" HeaderText="Ran ge" />
<asp:BoundColum n DataField="Prod uctId" Visible="true" ReadOnly="true" >
<HeaderStyle CssClass="Hidde n" />
<ItemStyle CssClass="hidde n" />
</asp:BoundColumn >
<asp:BoundColum n DataField="Cust omerId" Visible="true" ReadOnly="true" >
<HeaderStyle CssClass="Hidde n" />
<ItemStyle CssClass="hidde n" />
</asp:BoundColumn >
</Columns>
"Ryan Riddell" wrote:
I am using the DataGrid control from 4guys (http://aspnet.4guysfromrolla.com/dem...hlighter.aspx). I want to
display 2 columns and allow editing. The only column I want the user to be
able to change is the second column. I made this work via ReadOnly="true"
for the first column.
The second requirement is that the grid stores 2 table primary key values in columns 3 and 4. These columns will mean nothing to the user and
could potentially confuse them. For this reason I need to hide the columns.
So in the DataGrid definition on the .aspx page I added:
<asp:BoundColum n DataField="Prod uctId" Visible="false" ></asp:BoundColumn > <asp:BoundColum n DataField="Cust omerId" Visible="false" ></asp:BoundColumn >
Then in the update command I simply Response.Write out the values for now: Dim s1 As String = e.Item.Cells(1) .Text
Dim s2 As String = CType(e.Item.Ce lls(2).Controls (0), TextBox).Text
Dim s3 As String = e.Item.Cells(3) .Text
Response.Write( s1 + "__" + s2 + "::" + s3)

Doing this yields:
[correctColumn1]__[correctColumn2]:: <-s3 is blank

How do I get the values in the hidden third and fourth columns?

Thanks,
Ryan

Nov 18 '05 #3

hansiman

this worked for me:

<datagrid>
<asp:BoundColum n Visible="False" DataField="Empl oyeeID"
HeaderText="Emp loyeeID"></asp:BoundColumn >
.....

Sub dg_UpdateRow(By Val sender As Object,
ByVal e As DataGridCommand EventArgs)
Dim tb As TextBox = e.Item.Cells(0) .Controls(0)
Dim iEmployeeID As String = tb.Text
.....

/Morten

On Wed, 28 Jul 2004 06:45:03 -0700, Ryan Riddell
<Ry*********@di scussions.micro soft.com> wrote:

I am using the DataGrid control from 4guys (http://aspnet.4guysfromrolla.com/dem...hlighter.aspx). I want to display 2 columns and allow editing. The only column I want the user to be able to change is the second column. I made this work via ReadOnly="true" for the first column.

The second requirement is that the grid stores 2 table primary key values in columns 3 and 4. These columns will mean nothing to the user and could potentially confuse them. For this reason I need to hide the columns. So in the DataGrid definition on the .aspx page I added:

<asp:BoundColu mn DataField="Prod uctId" Visible="false" ></asp:BoundColumn >
<asp:BoundColu mn DataField="Cust omerId" Visible="false" ></asp:BoundColumn >

Then in the update command I simply Response.Write out the values for now:
Dim s1 As String = e.Item.Cells(1) .Text
Dim s2 As String = CType(e.Item.Ce lls(2).Controls (0), TextBox).Text
Dim s3 As String = e.Item.Cells(3) .Text
Response.Write (s1 + "__" + s2 + "::" + s3)

Doing this yields:
[correctColumn1]__[correctColumn2]:: <-s3 is blank

How do I get the values in the hidden third and fourth columns?

Thanks,
Ryan

Nov 18 '05 #4

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