Insert all the selected items from the listbox to a database

Hi Lokesh,

Follow the pattern below that I've for you to do so:
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Listbox1.SelectedItems gives you all the selected items in a list box.

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private void button3_Click(object sender, EventArgs e)
 {  

    SqlConnection conn = new SqlConnection(myConnectionString);

    conn.Open();  

   for (int i = 0; i < listBox1.SelectedItems.Count; i++)  
     {            var selectedValue = listBox1.SelectedItems[i].ToString(); //you get the selected value here.                          SqlCommand cmd = new SqlCommand("insert into myTable values('" + selectedValue + "';", conn);           cmd.ExecuteNonQuery(); 
     }  
conn.Close();
 }
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Hope you got the point.
Happy Coding :)

Mark it as answer if it helps.
Cheers!