合并两个数据字段(列)值并在列表框中显示-ASP.NET？

<asp:ListBox ID="listBox" runat="server"></asp:ListBox>

string fieldValue1 = "Value 1";
string fieldValue2 = "Value 2";
string mergedValue = fieldValue1 + " " + fieldValue2;

listBox.Items.Add(new ListItem(mergedValue));

<asp:ListBox ID="listBox" runat="server"></asp:ListBox>

protected void Page_Load(object sender, EventArgs e)
{
    string fieldValue1 = "Value 1";
    string fieldValue2 = "Value 2";
    string mergedValue = fieldValue1 + " " + fieldValue2;
    
    listBox.Items.Add(new ListItem(mergedValue));
}