Populate insert form field from GridView selection

Hi,

I'm trying to do something that seems like it should be simple, but I'm having trouble getting it to work. I have a page with a GridView and a FormView in Insert mode.

When the user selects a row in the gridview, I want to take the data keys from that selection and populate them to the appropriate textboxes in the form. I'm trying to do this in the

"GridView1_SelectedIndexChanged event" with the following code:

TextBox t;

t = (TextBox)FormView1.FindControl("myTextBox");

t.Text = (String)GridView1.SelectedDataKey.Values[0];

The text in "myTextBox" doesn't change, it remains blank. I've tried to find another event in which to put this code but so far no luck. I'm a newbie so I'm sure it's something obvious.

Can anyone help me with this? Thanks in advance.

Try moving your code to the FormView.DataBound event.

Hi Ed,

When I do that, I get "Object reference not set to an instance of an object. " I'm guessing that this is because the formview1_databound fires when the page is first loading, before there is a selected key from the gridview. I'm not sure that this is the case, it's just my best guess.

Do you have any suggestion for a workaround or alternate approach?

Thanks.

Once try this

ProtectedSub GridView1_SelectedIndexChanged(ByVal senderAsObject,ByVal eAs System.EventArgs)Handles GridView1.SelectedIndexChanged

Formview1.PageIndex = GridView1.SelectedIndex

EndSub

Hi Mahesh,

Okay, now I have this code but I still don't see the text I want populated into the text box. What am I doing wrong?

protectedvoid GridView1_SelectedIndexChanged(object sender,EventArgs e)

{

FormView1.PageIndex = GridView1.SelectedIndex;

TextBox t;

t = (TextBox)FormView1.FindControl("myTextBox");

t.Text = (String)GridView1.SelectedDataKey.Values[0];

}

How about this:

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{

for (int i = 0; i < GridView1.Rows.Count; i++)
{
if (GridView1.SelectedIndex == i)
{
TextBox t;

t = (TextBox)FormView1.FindControl("myTextBox");
t.Text = (String)GridView1.SelectedDataKey.Values[0];
}
}
}

Within your FormView.DataBound event, simply place a conditional statement which checks for the existence of a SelectedItem.

if (!GridView1.SelectedIndex.Equals(-1))

That did it! Thanks very much (I told you that I was a newbie :-).