How to make undo function in dropdown ASP.NET C#

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Can any one of you please quickly guide me asp.net c# a very basic problem
i have two drop down list box list1 and list2. List 1 has all user names with their ids, i have managed to transfer one user with his id in list 2, but if i want to do undo kind of activity i am unable to do it in same manner

ddUser.DataValueField.(??????) = ddSelectedUser.DataValueField;

can you please tell me what option should i select ?? so that i can run my program as per my requirement.

What I have tried:

This code is running fine

C#

protected void btnTransferUser_Click(object sender, System.EventArgs e)
    {
        if (ddUser.Items.Count < 1)
        {
            btnTransferUsr.Enabled = false;
        }
        else
        {
            string strUserName;
            int intUserID;

            strUserName = ddUser.SelectedItem.Text;
            if (!string.IsNullOrEmpty(strUserName))
            {
                lblErrorUsrCreation.Text = "";
                intUserID = int.Parse(ddUser.SelectedItem.Value);
                ddSelectedUser.DataValueField = ddUser.SelectedValue.ToString();
                ddSelectedUser.Items.Add(new ListItem(strUserName));
                ddUser.Items.Remove(ddUser.Items.FindByText(strUserName));
                btnTransferUsr.Enabled = false;
                btnUndoTransferUsr.Enabled = true;
            }
            else
            {
                lblErrorUsrCreation.Text = "User(s) Not Selected To Transfer";
                ddUser.TabIndex = 0;
                return;
            }
        }
    }

but at the same time if i want to do it with undo ... i am unable to do it

C#

protected void btnUndoTransferUsr_Click(object sender, System.EventArgs e)
    {
        if (ddSelectedUser.Items.Count < 1)
        {
            btnUndoTransferUsr.Enabled = false;
        }
        else
        {
            string strUserName;
            strUserName = ddSelectedUser.SelectedItem.Text;
            if (!string.IsNullOrEmpty(strUserName))
            {
                //ddUser.DataValueField = ddSelectedUser.DataValueField;
                ddUser.DataValueField = "113";
                lblErrorUsrCreation.Text = "Heloooooooo" + ddUser.DataValueField;
                return;
            }
            else
            {
                lblErrorUsrCreation.Text = "User(s) Not Selected From Selected User List, To Undo Transfer";
                ddSelectedUser.TabIndex = 0;
                return;
            }
        }
    }

Posted 4-Jul-19 21:40pm

Member 4756577

Updated 17-Jul-19 8:26am

ChauhanAjay

v2

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Comments

BillWoodruff 7-Jul-19 3:00am

So, what are you doing to PRESERVE the last user action information so you can undo the last action ?

Do you want to allow more than one item to be transferred ? If more than one item is transferred, do you want to undo multiple items ?

If the list of users does not change, you can implement a multiple undo simply.

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Mahesh Pratap Singh · Answer 1 · 2019-07-06T22:08:00

Have 2 different dictionaries for each drop-down and add/remove from those dictionary based on your do/undo/redo.
And let the dictionary be the data source of these dropdowns like this:

ddUser.DataSource = userDictionary;
ddUser.DataTextField = "Value";
ddUser.DataValueField = "Key";
ddUser.DataBind();

ddSelectedUser.DataSource = selectedUserDictionary;
ddSelectedUser.DataTextField = "Value";
ddSelectedUser.DataValueField = "Key";
ddSelectedUser.DataBind();

Member 4756577 · Answer 2 · 2019-07-17T08:26:00

Dear All thanks for your support.. i have tried this and it works please check

protected void btnTransferUser_Click(object sender, System.EventArgs e)
{
    if (ddUser.Items.Count < 1)
    {
        btnTransferUsr.Enabled = false;
    }
    else
    {
        string strUserName;
        int intUserID;

        strUserName = ddUser.SelectedItem.Text;
        if (!string.IsNullOrEmpty(strUserName))
        {
            //lblErrorUsrCreation.Text = "";
            //ddSelectedUser.DataValueField = ddUser.SelectedValue.ToString();
            //ddSelectedUser.Items.Add(new ListItem(strUserName));
            //ddUser.Items.Remove(ddUser.Items.FindByText(strUserName));
            //btnTransferUsr.Enabled = false;
            //btnUndoTransferUsr.Enabled = true;

            string x = ddUser.SelectedItem.Text;
            int id = int.Parse(ddUser.SelectedItem.Value);
            int lidx = ddUser.SelectedIndex;

            ddSelectedUser.Items.Add(new ListItem(x, id.ToString()));

            ddUser.Items.RemoveAt(lidx);

            btnTransferUsr.Enabled = false;
            btnUndoTransferUsr.Enabled = true;

        }
        else
        {
            lblErrorUsrCreation.Text = "User(s) Not Selected To Transfer";
            ddUser.TabIndex = 0;
            return;
        }
    }
}
protected void btnUndoTransferUsr_Click(object sender, System.EventArgs e)
{
    if (ddSelectedUser.Items.Count < 1)
    {
        btnUndoTransferUsr.Enabled = false;
    }
    else
    {
        string strUserName;
        int intUserID;

        strUserName = ddSelectedUser.SelectedItem.Text;
        if (!string.IsNullOrEmpty(strUserName))
        {
            //lblErrorUsrCreation.Text = "";
            //intUserID = int.Parse(ddSelectedUser.SelectedValue);
            //ddUser.DataValueField = ddSelectedUser.SelectedValue.ToString();
            //ddUser.Items.Add(new ListItem(strUserName));
            //ddSelectedUser.Items.Remove(ddSelectedUser.Items.FindByText(strUserName));
            //btnUndoTransferUsr.Enabled = false;
            //btnTransferUsr.Enabled = true;

            string x = ddSelectedUser.SelectedItem.Text;
            int id = int.Parse(ddSelectedUser.SelectedItem.Value);
            int lidx = ddSelectedUser.SelectedIndex;

            ddUser.Items.Add(new ListItem(x, id.ToString()));

            ddSelectedUser.Items.RemoveAt(lidx);
            if (ddSelectedUser.Items.Count > 0)
            {
                btnUndoTransferUsr.Enabled=true;
            }
            else
            {
                btnUndoTransferUsr.Enabled = false;
                btnTransferUsr.Enabled = true;
            }
        }
        else
        {
            lblErrorUsrCreation.Text = "User(s) Not Selected To Transfer";
            ddSelectedUser.TabIndex = 0;
            return;
        }
    }
}

How to make undo function in dropdown ASP.NET C#

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