Hi,
my program contains one gridview .gridview has dropdown list and
text as two columns.
drop down contains only 2 items..that are "Internal" and "External".If
select Internal the Text box
should be set to invisible...
Here goes my code..
=============================================================
<asp:GridView ID="gvNews" runat="server" AutoGenerateColumns="False"
OnRowCancelingEdit="gvNews_RowCancelingEdit"
OnRowEditing="gvNews_RowEditing" AllowPaging="True"
OnRowUpdating="gvNews_RowUpdating"
OnPageIndexChanging="gvNews_PageIndexChanging"
CssClass="bdytxt" BorderColor="LightSteelBlue"
CellPadding="3" OnRowDataBound="gvNews_RowDataBound">
<HeaderStyle CssClass="menutxt" BackColor="SteelBlue" /
>
<Columns>
<asp:TemplateField HeaderText="Id">
<ItemTemplate>
<asp:Label ID="lblNewsId" runat="server"
Text='<%#Bind("NewsId")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Title">
<ItemTemplate>
<asp:Label ID="lblTitle" runat="server"
Text='<%#Bind("Title")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtTitle" runat="server"
Text='<%#Eval("Title")%>'></asp:TextBox>
<asp:RequiredFieldValidator ID="rvTitle"
ControlToValidate="txtTitle" runat="server"
ErrorMessage="Title required">
</asp:RequiredFieldValidator>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description">
<ItemTemplate>
<asp:Label ID="lblDescription"
runat="server" Text='<%#Bind("Description")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtDescription"
runat="server" TextMode="MultiLine" Text='<%# Eval("Description")%>'></
asp:TextBox>
<asp:RequiredFieldValidator
ID="rvDescription" runat="server" ControlToValidate="txtDescription"
ErrorMessage="Description Required">
</asp:RequiredFieldValidator>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Type">
<ItemTemplate>
<asp:Label ID="lblType" runat="server"
Text='<%#Bind("Type")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddType"
AutoPostBack="true" DataSource='<%#GetType()%>' DataTextField="Type"
DataValueField="Type" runat="server"
SelectedValue='<%#Bind("Type")%>'
OnSelectedIndexChanged="ddType_SelectedIndexChanged">
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="URL">
<ItemTemplate>
<asp:Label ID="lblURL" runat="server"
Text='<%#Bind("URL")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtURL" runat="server"
Text='<%#Eval("URL")%>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="MM\DD\YY Time">
<ItemTemplate>
<asp:Label ID="lblNewsDate" runat="server"
Text='<%#Bind("NewsDate")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Edit">
<EditItemTemplate>
<asp:ImageButton ID="lbUpdate"
runat="server" CommandName="Update" ImageUrl="~/Images/icon-
floppy.gif">
</asp:ImageButton>
<asp:ImageButton ID="lbCancel"
runat="server" CommandName="Cancel" ImageUrl="~/Images/icon-pencil-
x.gif">
</asp:ImageButton>
</EditItemTemplate>
<ItemTemplate>
<asp:ImageButton ID="lbEdit"
runat="server" CommandName="Edit" ImageUrl="~/Images/icon-pencil.gif">
</asp:ImageButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
========================================================================
protected void ddType_SelectedIndexChanged(object sender, EventArgs
e)
{
string value = ((DropDownList)sender).SelectedValue;
if (value == "Internal")
{
TextBox txtUrl = (TextBox)(gvNews.FindControl("txtURL"));
// TextBox txtUrl = (TextBox)
((GridView)sender).FindControl("txtURL");
// txtUrl.Visible = false;
}
}
Now the in the above function ..I am unable to refer Text box(txtURL)
I am getting null reference exception...
I am a newbie..if i am doing any thing wrong ..kindly execuse me..
Can anybody has work around ..
Help me out..
Thanks in advance..
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