Add ListBox values toTextBox on Button click in ASP.Net did not work correctly

Question

I have a one list box and one text box, i want to add list box value to text box on Button Click , but its not working correctly, can you please help me ,i can add the item for text box but cant add more item for text box (MultiSelect)Thanks in advance

TextBox

<div class="col-sm-3">
    <asp:TextBox ID="txtDesignName" runat="server" CssClass="form-control" Width="250px" ></asp:TextBox>
 </div>

listBox

<div class="col-sm-3">
    <asp:ListBox ID="lstValue" runat="server" CssClass="content" Rows="5" ValidationGroup="save"
               Width="250" OnSelectedIndexChanged="lstValues_SelectedIndexChanged"></asp:ListBox>
</div>

Add Button

<asp:Button ID="btnAdd" runat="server" CssClass="button" Text="Add" ValidationGroup="add"
         Width="70" OnClick="btnAdd_Click" />

CodeBehind

protected void btnAdd_Click(object sender, EventArgs e)
{
    //if(txtDesignName.Text.Equals(string.Empty))
    //{
    //    return; 
    //}
    //else
    //{
        lstValue.Items.Add(txtDesignName.Text);
    //}
}

lstValues_SelectedIndexChanged

protected void lstValues_SelectedIndexChanged(object sender, EventArgs e)
        {
            txtQlt.Text = lstValue.SelectedItem.ToString();  
        }

are you trying to add items to the lists box or the textbox ? lstValue.Items.Add(txtDesignName.Text); will add items to the listbox.Mybe you got it mixed up — Creator
– Creator, Commented Mar 7, 2016 at 3:27

codeninja.sj · Accepted Answer · 2016-03-07 04:32:40Z

3

The question, you have asked and the code you have shown are both representing different purposes. So, I provided the two options; choose whatever you want.

To display all selected list box-items to your text-box

protected void btnDisplay_Click(object sender, EventArgs e) //create display button to do this process
{
  string selectedItems = string.Empty;
  string separator = ",";
  foreach (int i in lstValue.GetSelectedIndices())
  {
   selectedItems += lstValue.Items[i] + separator;
  }
  txtDesignName.Text = selectedItems.Trim(',');
}

To add text-box value to list-box items

protected void btnAdd_Click(object sender, EventArgs e)
{
  if (txtDesignName.Text.Trim() != string.Empty)
  {
    lstValue.Items.Add(new ListItem(txtDesignName.Text));
    txtDesignName.Text = string.Empty; //reset the text-box value
  }
}

edited Mar 7, 2016 at 4:32

answered Mar 7, 2016 at 4:11

codeninja.sj

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3 Comments

Codeone Over a year ago

Code is working, but cant add multi select value, im add the value its work but im add another value its working, always replace the add 1st value for it, example List Box Value (AA),(BB) , Firstly add the AA , secondly add BB , its not see AA , i want to Display AA BB

codeninja.sj Over a year ago

I guess, You may reset the list box items in the page_load event. Can you show your full code?

Codeone Over a year ago

Sir , I Do it, Its Working now, Thanks For the help ) its working now

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