Retrieve image from database on image control

your requirement is very simple

just follow theses two steps

protected void Page_Load(object sender, EventArgs e)
{
if (Request["__EVENTARGUMENT"] != null && Request["__EVENTARGUMENT"] == "yesDoubleClicked")
{
int idx = ListBox1.SelectedIndex;
ListItem item = ListBox1.SelectedItem;
BindImage(idx);
}
ListBox1.Attributes.Add("ondblclick", ClientScript.GetPostBackEventReference(ListBox1, "yesDoubleClicked"));
}
private void BindImage(int Id)
{
// fetch image url from database based on Id
Image1.ImageUrl = ""; // set fetched url
}

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