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How do I hide a button on page if datagrid empty

Posted on 2007-11-29
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Last Modified: 2013-11-26
I want to not display a button on a page if my datagrid is empty.

I just need to know hw to tell if the gridview is empty.


eg

If gridview1(whats the code to say it empty)

then
button1.visible = false
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Question by:edjones1
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j-w-thomas earned 250 total points
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if gridview.Items.count = 0 then
        button1.visible = false
else
        button1.visible = true
end if

John
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by:j-w-thomas
j-w-thomas earned 250 total points
Comment Utility
You can also add on to hide the datagrid column headers as well, just to 'clean' up the page look.

if gridview1.Items.count = 0 then
        button1.visible = false
        gridview1.visible = false
else
        button1.visible = true
        gridview1.visible = true
end if

hth,

John
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Expert Comment

by:Edjones
Comment Utility

Thanks

does not work on

 Protected Sub GridView1_RowDataBound

what should I use?
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Expert Comment

by:j-w-thomas
Comment Utility
Is it after the bind to the datagrid?

'/// first the bind ///
gridview1.dataBind()

'/// then the check for rows ///
if gridview1.Items.count = 0 then
        button1.visible = false
        gridview1.visible = false
else
        button1.visible = true
        gridview1.visible = true
end if

If not can you post the entire sub
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Expert Comment

by:Edjones
Comment Utility
I'm using a separe code file




    Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

        If GridView.Items.count = 0 Then

            Button1.Visible = False

        Else

            Button1.Visible = True

        End If
 
 

    End Sub

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by:j-w-thomas
Comment Utility
I thought that you had the entire sub finished except for this part. Is that true? I understand that you are a beginner on this subject, but it defintely needs more than that to work. Also you have it for a row command, is that waht you mean?

Try the code below and add in the correct select statement for your database and the connection string.

This is set up in a very simple format...
Sub BindData(s As Object, e As EventArgs)
 

Dim strSQLStatement As String = "SELECT * FROM TABLE_NAME"

Dim objCmd As OdbcCommand '/// or this needs to be OleDbCommand depending on your database

Dim objRdr As OdbcDataReader '/// or OleDbDataReader

'/// make sure that you have your connection string declared ///

	try		

		objCmd = New OdbcCommand(strSQLStatement,objConn)

		objConn.Open()

		objRdr = objCmd.ExecuteReader()

		dgDataGrid1.DataSource = objRdr

		dgDataGrid1.DataBind()

		objRdr.Close()

		objConn.Close()

		

		if dgDataGrid1.Items.Count = 0 then

			dgDataGrid1.Visible = false

			button1.visible = false

		else

			dgDataGrid1.Visible = true

			button1.visible = true

		end if
 

		if objConn.State = ConnectionState.Open then

			objConn.Close()

		end if

				

		catch objEx As Exception

				

			'/// you can put a custom error type message here ///
 

					

		finally

				

				if objConn.State = ConnectionState.Open then 

					objConn.Close() 

				end if
 

		end try
 

End Sub

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