Hide a Panel when GridView is empty

Question

I've a GridView inside a Panel that I want to hide when the child is empty because at the moment remains a fieldset with the legend text and nothing inside.

I've already tried to put something like Panel.Visible = GridView.Rows.Count > 0 in the Page_Load event but it doesn't works well.

How can I obtain the result that I need?

Thank you

Some more details:

If on first load the database table is empty I don't see the fieldset, when I add a row the Panel with the GridView doesn't appears; if on first load I have a row I can see the Panel with the GridView, when I delete the unique row anything disapears but never come back even if I insert a new row. I think that the Page_Load is not the right event.

Can you please share your Page_Load() event with your question? — Atanu Roy, Jun 12 '15 at 11:44

Dhaval · Answer 1 · 2015-06-12T08:58:42.720

2

try this..

Panel.Visible = (GridView.Rows.Count > 0?false:true);

edited Jun 12 '15 at 08:58

answered Jun 12 '15 at 08:57

Dhaval

2,341
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Put colon `:` instead of the semi-colon `;`. – Dhrumil Jun 12 '15 at 08:58
Please Check Edited Answer..!! – Dhaval Jun 12 '15 at 08:59
Hello, I've already tried this code and I get Always the same result: if on first load the database table is empty I don't see the `fieldset`, when I add an row the Panel with the GridView doesn't appears; if on first load I have a row I can see the Panel with the GridView, when I delete the unique row anything disapears but never come back even if I insert a new row. I think that the Page_Load is not the right event. – chenny Jun 12 '15 at 09:13

ManP · Answer 2 · 2015-06-12T21:54:44.967

Please try following steps:

Check for Panel.Visible = GridView.Rows.Count > 0 in a late page event such as Page_PreRender
Add OnRowDeleted event in GridView and check for Panel.Visible = GridView.Rows.Count > 0 if the row deleting is a last row. Also rebind the GridView as GridView.DataBind()
Add OnRowCreated event in GridView and repeat the same process as you did in case of row deletion.

Code:

protected void Page_PreRender(object sender, EventArgs e)
{
    Panel.Visible = GridView.Rows.Count > 0;
}

protected void GridView_RowCreated(object sender, GridViewRowEventArgs e)
{
    GridView.DataBind();
    Panel.Visible = GridView.Rows.Count > 0;

}
protected void GridView_RowDeleted(object sender, GridViewDeletedEventArgs e)
{
    GridView.DataBind();
    Panel.Visible = GridView.Rows.Count > 0;
}

I hope this will solve your issue.

score 1 · Accepted Answer · answered Jun 26 '15 at 12:18

1

In the end I found my problem... I've put the FormView for the insert and the GridView in different UpdatePanels, so unified all in the same UpdatePanel and used this code:

Panel.Visible = GridView.Rows.Count > 0;

in the GridView DataBound event and it worked.

Thank you everyone.

answered Jun 26 '15 at 12:18

chenny

769
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Thank you for not using a boolean response to identify a hard-coded true/false as some of the other answers did. – 182764125216 Dec 03 '15 at 22:01

score 0 · Answer 4 · answered Jun 12 '15 at 08:57

0

If you simply want to make your panel visible/invisible based on the Gridview Rows, then its as simple as this :

if(GridView.Rows.Count > 0)
    PanelId.Visible = true;
else
    PanelId.Visible = false;

But make sure you do this code after you have called the Gridview binding function.

Hope this helps.

answered Jun 12 '15 at 08:57

Dhrumil

3,221
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which is exactly what he already wrote, just in a more extensive way – LostPhysx Jun 12 '15 at 08:58
Hello, the GridView is binded by an ObjectDataSource without any code behind and so I don't know how can I put after binding. Thank you – chenny Jun 12 '15 at 09:08
After deleting or adding a row, you will have to make sure to check the condition again. `Page_Load` will work. Just check your condition on postback and rebind the GridView to update the row status. – Dhrumil Jun 12 '15 at 09:15

Hide a Panel when GridView is empty

4 Answers4