Web Forms :: Hide Control During Gridview Edit?
Apr 20, 2010
I am using Visual Studio 2005. I have a gridview and when it is in edit mode, there is a locked textbox and an associated dropdownlist for the signature field. If a name already exists in the database, it will show up in the textbox. In that case, I would like to hide the dropdownlist.
So far, I have not been able to figure out how to make this happen.
My latest attempt is this:
Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing meString = (CType(GridView1.Rows(e.NewEditIndex).Cells(2).FindControl("meSigLabel"), Label)).Text Dim meDDL As DropDownList = CType(GridView1.Rows(e.NewEditIndex).Cells(2).FindControl("edMESigDropDownList"), DropDownList) If meString <> String.Empty Then meDDL.Visible = False Else meDDL.Visible = True End If End SubI receive a NullReferenceError. During debugging, the mestring variable has a value but the meDDL is Nothing.What am I doing wrong?
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{
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{
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ConnectionString="<%$ ConnectionStrings:ttuser %>" SelectCommand="SELECT
TE.TimeEntryID,
P.ProjectName,
CAT.CategoryName,
TE.TimeEntryDescription,
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FROM dbo.aspnet_starterkits_TimeEntry TE inner join
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dbo.aspnet_starterkits_Projects P on
CAT.ProjectID=P.ProjectID
Where TimeEntryUserID=(SELECT UserId FROM dbo.aspnet_Users WHERE
UserName=@UserName) AND
TE.TimeEntryDate=@WeekEnding
" OldValuesParameterFormatString="original_{0}" UpdateCommand="UPDATE dbo.aspnet_starterkits_TimeEntry
SET
TimeEntryDescription=@TimeEntryDescription,
TimeEntryDuration=@TimeEntryDuration,
TimeEntryDate=@TimeEntryDate
WHERE
TimeEntryID=@original_TimeEntryID">
<SelectParameters>
<asp:ControlParameter ControlID="UserList" Name="UserName"
PropertyName="SelectedValue" />
<asp:ControlParameter ControlID="WeekEnding2" Name="WeekEnding"
PropertyName="Text" />
</SelectParameters>
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<asp:Parameter Name="TimeEntryDescription" />
<asp:Parameter Name="TimeEntryDuration" />
<asp:Parameter Name="TimeEntryDate" />
<asp:Parameter Name="original_TimeEntryID" />
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BorderStyle="None" Width="100%" CellPadding="2" PageSize="25"
DataKeyNames="TimeEntryID" onrowdatabound="GridView1_RowDataBound"
onrowupdating="GridView1_RowUpdating" >
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<%--<asp:CommandField ShowEditButton="True" />--%>
<asp:BoundField DataField="TimeEntryID" HeaderText="ID"
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ItemStyle-HorizontalAlign="Center" >
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ID="DropDownList1"
runat="server"
DataSourceID="sdsDdlProjectsEdit"
DataTextField="ProjectName"
DataValueField="ProjectID"
AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
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<asp:SqlDataSource
ID="sdsDdlProjectsEdit"
runat="server"
ConnectionString="<%$ ConnectionStrings:ttuser %>"
SelectCommand="SELECT ProjectID,ProjectName FROM dbo.aspnet_starterkits_Projects">
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<ItemStyle HorizontalAlign="Center" />
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ID="DropDownList2"
runat="server"
DataSourceID="sdsDDL2"
DataTextField="CategoryName"
DataValueField="CategoryID">
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ID="sdsDDL2"
runat="server"
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<asp:Parameter Name="ProjectID" />
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</asp:SqlDataSource>
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</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
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<ItemStyle HorizontalAlign="Center"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="TimeEntryDuration" HeaderText="Hours"
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<ItemStyle HorizontalAlign="Center"></ItemStyle>
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GridViewstockcalc.Visible = true;
GridViewstockcalc.DataSource = dataSetstockcap.Tables[0];
GridViewstockcalc.DataBind();
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<asp:GridView ID="GridViewstockcalc" runat="server"
HeaderStyle-BackColor="#444444"
HeaderStyle-ForeColor="White"
onrowcommand="GridViewstockcalc_RowCommand" Height="150px"
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onrowupdating="GridViewstockcalc_RowUpdating">
<Columns>
<asp:CommandField ShowEditButton="true" ShowCancelButton="true" />
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<ItemTemplate>
<%# Eval("ticker")%>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtticker" Text='<%# Eval("ticker")%>' />
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</asp:TemplateField>
<asp:BoundField DataField="fhlb_ID" HeaderText="ticker" ReadOnly="true" />
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Feb 25, 2011
I use asp.net 4 + c#,I have a GridView with many rows.When a User click the EDIT button in GridView I need to retrieve a Control in that specific row (now in edit mode).This Logic should work on GridEvent_RowUpdatingAt the moment my code (wrong) look inside every Row, so the Control founded is not unique and I receive an error.
// Event handler
protected void uxManageSponsoredContentsDisplayer_RowUpdating(object sender, GridViewUpdateEventArgs e)
// My code (Wrong!!!!):
foreach (GridViewRow row in uxManageSponsoredContentsDisplayer.Rows)
{
TextBox uxStartDate = (TextBox)row.FindControl("uxEffectiveStartDateInput");
}
Hope my question is clear. Solution:
TextBox uxStartDate = (TextBox)uxManageSponsoredContentsDisplayer.Rows[e.RowIndex].FindControl("uxEffectiveStartDateInput");
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