asked on

Passing parameter to code behind

Hi,

in the front end, I have the code like this
<asp:Button id="MoveAllbtn" onclick="MoveAllbtn_Click" CustomParameter="listBox1" runat="server" text=">>" />

Since I want to use the same function, I want to pass the same of the listBox to the function.

In the code behind, I have the code

    protected void MoveAllbtn_Click(object sender, EventArgs e)
    {
       

        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
              //some codes
        }
        
        string ID=e.CommandArgument.ToString();
	testBox.Text = ID;
        
    }

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I am getting error

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

any ideas? thanks

Ramkisan Jagtap

Convert object sender to button and then get its id

protected void MoveAllbtn_Click(object sender, EventArgs e)
    {
       

        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
              //some codes
        }
        
       Button moveAllbtn=(Button)sender;
	testBox.Text = moveAllbtn.ID;
        
    }

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mcrmg

ASKER

Thanks for the quick reply. I am geting this error:

CS0104: 'Button' is an ambiguous reference between 'System.Web.UI.WebControls.Button' and 'System.Windows.Forms.Button'

Daniel Van Der Werken

This is how you fix that. However, I don't think this code is going to function the way you want.

   protected void MoveAllbtn_Click(object sender, EventArgs e)
    {

        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
            //string iText = item.Text;
        }

        System.Web.UI.WebControls.Button moveAllBtn = (System.Web.UI.WebControls.Button)sender;

        string ID = moveAllBtn.CommandArgument.ToString();
        testBox.Text = ID;
    }

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Can you explain more on what you're trying to do?

Ramkisan Jagtap

Yes, as Daniel said use System.Web.UI.WebControls.Button

Daniel Van Der Werken

This will get the custom value you passed:

    protected void MoveAllbtn_Click(object sender, EventArgs e)
    {

        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
            string iText = item.Text;
        }

        System.Web.UI.WebControls.Button moveAllBtn = (System.Web.UI.WebControls.Button)sender;

        AttributeCollection attributColl = moveAllBtn.Attributes;
        if (attributColl != null && attributColl.Count > 0 && attributColl["CustomParameter"] != null)
        {
            string myCustomParameterValue = attributColl["CustomParameter"];
        }

        string ID = moveAllBtn.CommandArgument.ToString();
        testBox.Text = ID;
    }

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mcrmg

ASKER

I am getting this error (sorry)

CS0104: 'AttributeCollection' is an ambiguous reference between 'System.Web.UI.AttributeCollection' and 'System.ComponentModel.AttributeCollection'

Ramkisan Jagtap

Use System.Web.UI.AttributeCollection there

Daniel Van Der Werken

You'd have to cast. Seems strange. You're adding too many using statements.

        System.Web.UI.AttributeCollection attributColl = (System.Web.UI.AttributeCollection)moveAllBtn.Attributes;
        if (attributColl != null && attributColl.Count > 0 && attributColl["CustomParameter"] != null)
        {
            string myCustomParameterValue = attributColl["CustomParameter"];
        }

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Get rid of your Windows using if you can.

mcrmg

ASKER

This is what I have

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
//using System.Windows.Forms;
using System.Text;
using System.ComponentModel;
using System.Drawing;
using System.Web.UI.AttributeCollection;

public partial class _test2 : System.Web.UI.Page

{
    protected void Page_Load(object sender, EventArgs e)
    {


    }

    protected void MoveAllbtn_Click(object sender, EventArgs e)
    {



        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
            //something
        }

        System.Web.UI.WebControls.Button moveAllBtn = (System.Web.UI.WebControls.Button)sender;

        AttributeCollection attributColl = moveAllBtn.Attributes;
        if (attributColl != null && attributColl.Count > 0 && attributColl["CustomParameter"] != null)
        {
            string myCustomParameterValue = attributColl["CustomParameter"];
        }

        string ID = moveAllBtn.CommandArgument.ToString();
        testBox.Text = ID;
        
    }

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Ramkisan Jagtap

Does it work now?

mcrmg

ASKER

this is the error I am getting

CS0138: A using namespace directive can only be applied to namespaces; 'System.Web.UI.AttributeCollection' is a type not a namespace

Ramkisan Jagtap

Remove following line:
using System.Web.UI.AttributeCollection;

mcrmg

ASKER

After removing,

CS0104: 'AttributeCollection' is an ambiguous reference between 'System.Web.UI.AttributeCollection' and 'System.ComponentModel.AttributeCollection'

thanks

ASKER CERTIFIED SOLUTION

Daniel Van Der Werken

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mcrmg

ASKER

I am sorry if I confused everyone....this is the latest code I use, and it looks like it is moving..thanks

The error I am getting is
CS0103: The name 'myCustomParameterValue' does not exist in the current context

        foreach (var item in listBox1.Items.Cast<ListItem>().Reverse())
        {
            string iText = item.Text;
        }

        System.Web.UI.AttributeCollection attributColl = (System.Web.UI.AttributeCollection)MoveAllbtn.Attributes;
        if (attributColl != null && attributColl.Count > 0 && attributColl["CustomParameter"] != null)
        {
            string myCustomParameterValue = attributColl["CustomParameter"];
        }

        testBox.Text = myCustomParameterValue;

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SOLUTION

Ramkisan Jagtap

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mcrmg

ASKER

Thank you very much.