asp.net Button Error

Question

button gives error like this

CS1061: 'web_holding_adminpanel_masterpage_spotadd_aspx' does not contain a definition for 'btnSave_Click' and no accessible extension method 'btnSave_Click' accepting a first argument of type 'web_holding_adminpanel_masterpage_spotadd_aspx' could be found (are you missing a using directive or an assembly reference?)

  <table class="w-100">
            <tr>
                <td style="width: 374px">
                    <asp:Label ID="Label2" runat="server" Text="Ad Soyad:"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtAdSoyad" class="form-control form-control-lg" runat="server" Width="100%"></asp:TextBox>
                </td>
                <td>&nbsp;</td>
            </tr>
            <tr>
                <td style="width: 374px">
                    <asp:Label ID="Label3" runat="server" Text="Görev:"></asp:Label>
                </td>
                <td>
                    <asp:TextBox ID="txtGorev" class="form-control form-control-lg" runat="server" Width="100%"></asp:TextBox>
                </td>
                <td>&nbsp;</td>
            </tr>
            <tr>
                <td style="width: 374px">
                    <asp:Label ID="Label4" runat="server" Text="Metin:"></asp:Label>
                </td>
                <td>
                    <asp:TextBox class="form-control form-control-lg" ID="txtMetin" runat="server" Width="100%"></asp:TextBox>
                </td>
                <td>&nbsp;</td>
            </tr>
            <tr>
                <td style="height: 23px; width: 374px">
                    <asp:Label ID="Label5" runat="server" Text="Resim:"></asp:Label>
                </td>
                <td style="height: 23px">
                    <asp:FileUpload ID="fuİmage" runat="server" class="form-control form-control-lg" />
                </td>
                <td style="height: 23px"></td>
            </tr>
            <tr>
                <td style="width: 374px">&nbsp;</td>
                <td>
                    <asp:Button ID="btnSave" class="btn btn-info" runat="server" Text="Kaydet" OnClick="btnSave_Click" />
                </td>
                <td>&nbsp;</td>
            </tr>
            <tr>
                <td style="width: 374px">&nbsp;</td>
                <td>
                    <asp:Label ID="lblMessage" runat="server"></asp:Label>
                </td>
                <td>&nbsp;</td>
            </tr>
        </table>

I ask for your help

Answer 1

Go to the spotadd.aspx.cs file (or maybe web_holding_adminpanel_masterpage_spotadd.aspx.cs; you can use the Solution Explorer to open the code file), and add a function to your class:

protected void btnSave_Click( object sender, EventArgs e )
{

}

It will be called when you press the "Kaydet" button. You should also implement this function.

Answer 2

Hi @kadir koçaslan,

As the error message says, it is a problem with the btnSave Button.

You use the onclick event in the front end, but you don't match the corresponding event handler in the back end code.

https://learn.microsoft.com/en-us/dotnet/api/system.web.ui.webcontrols.button.onclick?view=netframework-4.8.1

protected void btnSave_Click(object sender, EventArgs e){}

Best regards,
Lan Huang

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