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How to validate control in asp.net GridView which is doing bulk update

Hi guys,

I have got a gridview which has got a dropdownlist and a textbox. At the moment i can select the value from the dropdown list but can leave the textbox blank. I want to add the functionality that if i select the value from the dropdown list then the textbox becomes required in that particular row of the gridview.

I am using the following the http://msdn.microsoft.com/en-us/library/aa992036(v=vs.80).aspx tutorial from microsoft to perform the bulkupdate.

can i add the above functionality with the bulk update?

any help would be highly appreciated

regards
Ali

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Miguel Oz

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Ali Shah

ASKER

Hi Mas,

thanks for the reply, your suggestions work well with the single update for a single control but i want something for gridview bulkupdate. i suppose i need to itereate through each control of the gridview to implement this. But as i am quite new in .Net programming so i couldn't figure out how to achieve this.

regards

SOLUTION

Miguel Oz

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Ali Shah

ASKER

Thanks again for reply, and sorry to be a pain but it woud be really great if you could give me the start point.

Below is the code for my dropdownlist itemtemplate

<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True"
SelectedValue='<%# Bind("Actual") %>'>
<asp:ListItem Text ="--" Value =""></asp:ListItem>
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
<asp:ListItem>4</asp:ListItem>
<asp:ListItem>5</asp:ListItem>
</asp:DropDownList>

</ItemTemplate>

When i run the page the initial text of the dropdown is "--" and it's value is "". Now i want that if i select the value other than "" then the txtbox should be enabled otherwise it is disabled. Now i have tried the following code

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList drp = GrdRisks.FindControl("DropDownList1") as DropDownList;
TextBox txt = GrdRisks.FindControl("TextBox2") as TextBox;

if (drp.SelectedValue != "")
{
txt.Enabled = true;
}
else
{
txt.Text = "";
txt.Enabled = false;
}
}

but it gave me the following error when i tried changing the selected value

"NULLReference exception was unhandled by usercode"
"Object reference not set to an instance of object"

thanks

SOLUTION

guru_sami

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Ali Shah

ASKER

Thank you so much for your great help. This is working fine i need a bit more help from you guys and i have asked another question in the forum https://www.experts-exchange.com/questions/27746876/How-to-Make-the-text-field-of-a-gridview-required-depending-on-the-selected-value-of-dropdown-control-of-the-same-gridview.html
looking forward for the help again.

kind regards,
ALi