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set telerik grid EditFormSettings item visibility at runtime. I am getting error as "Object reference not set to an instance of an object. "

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Grid

This is a migrated thread and some comments may be shown as answers.

Sireesha asked on 28 Feb 2014, 07:01 AM

Protected Sub rgCallers_ItemCommand(sender As Object, e As Telerik.Web.UI.GridCommandEventArgs) Handles rgCallers.ItemCommand

Dim EditFormItem As GridEditFormItem = TryCast(e.Item, GridEditFormItem)

EditFormItem.FindControl("txtAddress").Visible = True

End Sub

001.<EditFormSettings EditFormType="Template">

002. <FormTemplate>

003. <table id="tblCallerEdit" runat="server" cellpadding="0" cellspacing="0" style="width: 100%;

004. height: 100%;" border="0">

005. <tr>

006. <td valign="middle" style="height: 26px; background-color: #DDE1E6;" align="left"

007.

colspan="2">

008.

<asp:Label ID="lblSubHeading" runat="server" CssClass="clsFormTemplateHeader"

009.

Text="Caller Details"></asp:Label>

010. </td>

011. <td style="width: 5px; text-align: right; background-color: #DDE1E6; height: 26px;"

012.

align="right">

013. </td>

014. </tr>

015. <tr>

016. <td valign="top" style="width: 30px; height: 22px;">

017. </td>

018. <td valign="top" align="left">

019.

<table style="width: 310px; height: 70px; margin-left: 260px;" class="clsTestTable">

020.

<tr>

021.

<td style="text-align: right; width: 150px; height: 18px;">

022.

<asp:Label ID="lblFirstName" runat="server">First Name</asp:Label>

023.

</td>

024.

<td style="width: 200px; text-align: left; height: 18px;">

025.

<div style="float: left; padding-right: 5px">

026.

<asp:TextBox ID="txtFirstName" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "FirstName") %>'

027.

Rows="2"></asp:TextBox></div>

028.

<asp:RequiredFieldValidator ID="rfvFirstName" runat="server" ControlToValidate="txtFirstName"

029.

ErrorMessage="First name is required" ValidationGroup="PersonalInfo">*</asp:RequiredFieldValidator>

030.

</td>

031.

</tr>

032.

<tr>

033.

<td style="text-align: right; height: 18px; width: 150px;">

034.

<asp:Label ID="lblLastName" runat="server">Last Name</asp:Label>

035.

</td>

036.

<td style="height: 18px; width: 200px; text-align: left;">

037.

<div style="float: left; padding-right: 5px">

038.

<asp:TextBox ID="txtLastName" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "LastName") %>'

039.

Rows="2"></asp:TextBox></div>

040.

<asp:RequiredFieldValidator ID="rfvLastName" runat="server" ControlToValidate="txtLastName"

041.

ErrorMessage="Last name is required" ValidationGroup="PersonalInfo">*</asp:RequiredFieldValidator>

042.

</td>

043.

</tr>

044.

<tr>

045.

<td style="text-align: right; height: 18px; width: 150px;">

046.

<asp:Label ID="lblCompany" runat="server" Text="Company"></asp:Label>

047.

</td>

048.

<td>

049.

<div style="float: left; padding-right: 5px">

050.

<asp:TextBox ID="txtCompany" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "Company") %>'

051.

Rows="2"></asp:TextBox></div>

052.

<asp:RequiredFieldValidator ID="rfvCompany" runat="server" ControlToValidate="txtCompany"

053.

ErrorMessage="Company is required" ValidationGroup="PersonalInfo">*</asp:RequiredFieldValidator>

054.

</td>

055.

</tr>

056.

<tr>

057.

<td style="text-align: right; height: 18px; width: 150px;">

058.

<asp:Label ID="lblPhoneNo" runat="server" Text="Tel No"></asp:Label>

059.

</td>

060.

<td>

061.

<div style="float: left; padding-right: 5px">

062.

<asp:TextBox ID="txtPhoneNo" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "PhoneNo") %>'

063.

Rows="2"></asp:TextBox></div>

064.

<asp:RequiredFieldValidator ID="rfvPhoneNo" runat="server" ControlToValidate="txtPhoneNo"

065.

ErrorMessage="Tel No is required" ValidationGroup="PersonalInfo">*</asp:RequiredFieldValidator>

066.

</td>

067.

</tr>

068.

<tr>

069.

<td style="text-align: right; height: 18px; width: 150px;">

070.

<asp:Label ID="lblEmail" runat="server" Text="Email"></asp:Label>

071.

</td>

072.

<td>

073.

<div style="float: left; padding-right: 5px">

074.

<asp:TextBox ID="txtEmail" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "Email") %>'

075.

Rows="2"></asp:TextBox></div>

076.

<asp:RequiredFieldValidator ID="rfvEmail" runat="server" ControlToValidate="txtEmail"

077.

ErrorMessage="Email is required" ValidationGroup="PersonalInfo">*</asp:RequiredFieldValidator>

078.

</td>

079.

</tr>

080.

<tr id="trAddress" runat="server" visible="false">

081.

<td style="text-align: right; height: 18px; width: 150px;">

082.

<asp:Label ID="lblAddress" runat="server" Text="Address/Erf" Visible="false"></asp:Label>

083.

</td>

084.

<td>

085.

<div style="float: left; padding-right: 5px">

086.

<asp:TextBox ID="txtAddress" runat="server" MaxLength="50" Width="145px" Text='<%# Bind("Address")%>'

087.

Rows="2" Visible="false"></asp:TextBox></div>

088.

</td>

089.

</tr>

090.

<tr id="trAccountNo" runat="server" visible="false">

091.

<td style="text-align: right; height: 18px; width: 150px;">

092.

<asp:Label ID="lblAccountNo" runat="server" Text="Account Number" Visible="false"></asp:Label>

093.

</td>

094.

<td>

095.

<div style="float: left; padding-right: 5px">

096.

<asp:TextBox ID="txtAccountNo" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "AccountNumber")%>'

097.

Rows="2" Visible="false"></asp:TextBox></div>

098.

</td>

099.

</tr>

100.

<tr id="trSuburb" runat="server" visible="false">

101.

<td style="text-align: right; height: 18px; width: 150px;">

102.

<asp:Label ID="lblSuburb" runat="server" Text="Suburb" Visible="false"></asp:Label>

103.

</td>

104.

<td>

105.

<div style="float: left; padding-right: 5px">

106.

<asp:TextBox ID="txtSuburb" runat="server" MaxLength="50" Width="145px" Text='<%# Bind( "Suburb")%>'

107.

Rows="2" Visible="false"></asp:TextBox></div>

108.

</td>

109.

</tr>

110.

<tr>

111.

<td style="width: 150px; height: 18px; text-align: right">

112.

<asp:Label ID="lblSys" runat="server" Text='<%# GetSystem() %>'></asp:Label>

113.

</td>

114.

<td style="width: 200px; height: 18px; text-align: left">

115.

<div style="float: left; padding-right: 5px">

116.

<telerik:RadComboBox ID="ddlSys" runat="server" Width="144px" Skin="Default" EnableEmbeddedSkins="true"

117.

DataSourceID="SQLDataSource1" DataTextField="SystemName" DataValueField="SystemID"

118.

SelectedValue='<%# Eval("SysID") %>'>

119.

</telerik:RadComboBox>

120.

</div>

121.

<asp:RequiredFieldValidator ID="rfvSys" runat="server" ValidationGroup="PersonalInfo"

122.

InitialValue="- Select a municipality -" ErrorMessage="Please select municipality"

123.

ControlToValidate="ddlSys" SetFocusOnError="True" Height="1px" Width="1px">*</asp:RequiredFieldValidator>

124.

</td>

125.

</tr>

126.

<tr>

127.

<td style="width: 150px; height: 18px; text-align: right">

128.

<asp:Label ID="lblEnabled" runat="server">Enabled</asp:Label>

129.

</td>

130.

<td style="width: 200px; height: 18px; text-align: left">

131.

<div style="float: left; padding-right: 5px">

132.

<asp:CheckBox ID="chkEnabled" runat="server" Checked='<%# If(IsDBNull(Eval("Enabled")), False, Eval("Enabled")) %>' /></div>

133.

</td>

134.

</tr>

135.

</table>

136. </td>

137. <td>

138.

139. </td>

140. </tr>

141. <tr>

142. <td colspan="2" style="height: 40px; background-color: #DDE1E6; text-align: center;">

143.

<div id="Zone1">

144.

<asp:Button ID="btnUpdate" Text='<%# If(CBool(DataBinder.Eval(Container, "OwnerTableView.IsItemInserted")), "Insert User", "Update User") %>'

145.

runat="server" CausesValidation="True" CommandName='<%# If(CBool(DataBinder.Eval(Container, "OwnerTableView.IsItemInserted")), "PerformInsert", "Update") %> '

146.

Width="145px" ValidationGroup="PersonalInfo" />

147.

<asp:Button ID="btnCancel" runat="server" CausesValidation="False" CommandName="Cancel"

148.

Text="Cancel" Width="145px" /></div>

149. </td>

150. <td style="background-color: #DDE1E6;">

151.

152. </td>

153. </tr>

154. <tr>

155. <td>

156. </td>

157. <td style="text-align: left">

158.

<asp:ValidationSummary ID="ValidationSummary2" runat="server" ValidationGroup="PersonalInfo"

159.

Width="250px" DisplayMode="BulletList" />

160. </td>

161. <td>

162. </td>

163. </tr>

164. </table>

165. </FormTemplate>

166. <FormCaptionStyle BorderStyle="Solid" />

167. <FormStyle BackColor="#F2F2F2" BorderColor="#BEBEBE" BorderStyle="Solid" BorderWidth="1px" />

168. </EditFormSettings>

I am getting an error as
Object reference not set to an instance of an object.

2 Answers, 1 is accepted

answered on 28 Feb 2014, 08:54 AM

Hi Sireesha,

I guess you want to access a control in the EditForm template. Please make sure you have set the visibility of the <tr> true and set visible as false only for the controls. Check the below code snippet.

ASPX:

<tr id="trAddress" runat="server" visible="true">

<td>

<asp:Label ID="lblAddress" runat="server" Text="Address/Erf" Visible="false"></asp:Label>

</td>

<td>

<asp:TextBox ID="txtAddress" runat="server" Text='<%# Bind("Address")%>' Visible="false"></asp:TextBox></div>

</td>

</tr>

C#:

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)

{

if (e.Item is GridEditableItem && e.Item.IsInEditMode)

{

GridEditableItem edit = (GridEditableItem)e.Item;

TextBox txt = (TextBox)edit.FindControl("txtAddress");

txt.Visible = true;

Label lbl = (Label)edit.FindControl("lblAddress");

lbl.Visible = true;

}

Thanks,
Princy

answered on 28 Feb 2014, 11:05 AM

Hi Princy,

Its working perfectly fine.
Thank you so much.

Here is my VB.Net code.

Protected Sub rgCallers_ItemDataBound(sender As Object, e As GridItemEventArgs) Handles rgCallers.ItemDataBound

If (boolViewCallerAdditionalFields = True) Then

If TypeOf e.Item Is GridEditableItem AndAlso e.Item.IsInEditMode Then

Dim edit As GridEditableItem = TryCast(e.Item, GridEditableItem)

Dim txtAddress As TextBox = TryCast(edit.FindControl("txtAddress"), TextBox)

txtAddress.Visible = True

Dim lblAddress As Label = DirectCast(edit.FindControl("lblAddress"), Label)

lblAddress.Visible = True

End If

End Sub

Regards,
Sireesha.