No overload for 'lnkCustomer_Click' matches delegate 'System.EventHandler'

Question

2.00/5 (1 vote)

See more:

need to set the Text in a gridview column to something other than what shows up in gridview with this code:

ASP.NET

<asp:LinkButton ID="lnkCustomer" runat="server"
     OnClick="lnkCustomer_Click" Text='<%# Eval("ImgLnk") %>'></asp:LinkButton>

Of course what shows up is the contents of "ImgLnk" in string form which is a hyper link ie "http://...." I would rather it say "Picture" in gridview.

I am trying to use this combo:

Default aspx:

ASP.NET

<asp:TemplateField HeaderText="StoreImg">
                        <ItemTemplate><asp:LinkButton ID="LinkButton1" runat="server"
                        OnClick="lnkCustomer_Click" Text='Picture'
                            CommandName="CustomerLink" CommandArgument='<%# Eval("ImgLnk") %>'></asp:LinkButton>

Code behind:

C#

protected void lnkCustomer_Click(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "CustomerLink")
        {
            Response.Redirect(e.CommandArgument.ToString());

       }

I get this error message:

No overload for 'lnkCustomer_Click' matches delegate 'System.EventHandler'	Default.aspx

I have tried and tried, but I can't seem to make the correction. Please help.

Thanks!

Posted 10-Aug-12 10:01am

Member 8759797

Updated 10-Aug-12 10:12am

Wendelius

v2

Add a Solution

Comments

[no name] 10-Aug-12 16:07pm

Try protected void lnkCustomer_Click(object sender, EventArgs e)

Member 8759797 10-Aug-12 16:36pm

Thanks everyone for your help to this point! When I have tried your solution of (...EventArgs e)I get this message which has added to my confusion: the 'System.EventArgs' does not contain a definition for 'CommandName' and no extension method 'CommandName' accepting a first argument of type 'System.EventArgs' could be found (are you missing a using directive or an assembly reference?)

Please continue to offer suggestions...I will try them all!

Member 13928033 3-Oct-18 5:19am

i tried nd tried but this code didnt work yet.so please post proper solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

fjdiewornncalwe · Accepted Answer · 2012-08-10T10:16:00

Solution 1

As Wes has pointed out in his comment, the definition of your method is incorrect.
If you are responding to a click event on a LinkButton as you are in this case, then the method must have a definition that matches protected void MethodName(object sender, EventArgs e). Yours is using GridViewCommandEventArgs which is used to respond to Command events from a DataGrid.

Update: If the LinkButton is used from within the GridView, then you won't want to have the onclick handler setup as part of the LinkButton html element, but rather in the oncommand handler for the grid itself, in which case your original code will work as is.

Posted 10-Aug-12 10:16am

fjdiewornncalwe

Updated 10-Aug-12 10:39am

v2

Comments

Member 8759797 10-Aug-12 16:36pm

Thanks everyone for your help to this point! When I have tried your solution of (...EventArgs e)I get this message which has added to my confusion: the 'System.EventArgs' does not contain a definition for 'CommandName' and no extension method 'CommandName' accepting a first argument of type 'System.EventArgs' could be found (are you missing a using directive or an assembly reference?)

Please continue to offer suggestions...I will try them all!

fjdiewornncalwe 10-Aug-12 16:38pm

You can ignore the if statement you have. You don't need to know the command name because the control firing the command is known to the handler already. Just remove the if statement and it will work as you want it to.

Sergey Alexandrovich Kryukov 10-Aug-12 16:38pm

Correct, a 5.
--SA

fjdiewornncalwe 10-Aug-12 16:57pm

Thanks, Sergey.

Wendelius 10-Aug-12 16:46pm

Indeed, 5+

fjdiewornncalwe 10-Aug-12 16:57pm

Thank You, Mika

Member 8759797 10-Aug-12 17:16pm

Yes Thank you. I have tried your suggestion. The modal popup does appear, but the picture that is access by the url contained in "ImgLnk" in the sqlDb does not appear. It is as though the eval condition is ignored. I am learning from your helpful suggestion though!

fjdiewornncalwe 10-Aug-12 17:24pm

Check the HTML that your page produces by viewing source in the browser. Look and see whether the value you get is correct or not there. If it is not, then you have another question to deal with.

Espen Harlinn 28-Aug-12 9:33am

5'ed!

Wendelius · Accepted Answer · 2012-08-10T10:16:00

Solution 2

The System.EventHandler delegate expects you to have a method with a specific signature present. See: EventHandler Delegate[^]

So your code should probably be like:

C#

protected void lnkCustomer_Click(object sender, System.EventArgs e)
    {
        ...
    }

Addition:
Casting the sender to link button:

C#

protected void lnkCustomer_Click(object sender, System.EventArgs e)
    {
        LinkButton button = sender as LinkButton;
        if (button.CommandName == "CustomerLink")
           ...
    }

Posted 10-Aug-12 10:16am

Wendelius

Updated 10-Aug-12 10:45am

v2

Comments

Member 8759797 10-Aug-12 16:36pm

Thanks everyone for your help to this point! When I have tried your solution of (...System.EventArgs e)I get this message which has added to my confusion: the 'System.EventArgs' does not contain a definition for 'CommandName' and no extension method 'CommandName' accepting a first argument of type 'System.EventArgs' could be found (are you missing a using directive or an assembly reference?)

Please continue to offer suggestions...I will try them all!

Wendelius 10-Aug-12 16:45pm

The EventArgs is a 'generic' class and doesn't hold this information. However, if you cast the sender to a linkbutton, you'll be able to fetch the CommandName.

See the updated answer.

Sergey Alexandrovich Kryukov 10-Aug-12 16:38pm

Right, a 5.
--SA

Wendelius 10-Aug-12 16:46pm

Thanks SA :)

Member 8759797 10-Aug-12 17:36pm

So this technique works wonderfully. The image was showing in a modal popup up window and now it is not. However, I think there must be a problem that is differently related so...

This is the answer for me! Thanks so much each of you. If anyone has a suggestion of a book that might help as I learn, I will be most grateful.

Wendelius 10-Aug-12 17:40pm

Glad it helped :) Currently I have no good book references for you, but you might want to post another question about those either in Q&A or the forums. I bet you get some good suggestions!

Member 8759797 10-Aug-12 23:40pm

Yes I think you are right and I will! Thanks.

Espen Harlinn 28-Aug-12 9:33am

5'ed!

Wendelius 31-Aug-12 14:26pm

Thanks Espen :)