Hi geethanjal,
Check this example. Now please take its reference and correct your code.
Form Design

Code
C#
private void Form1_Load(object sender, EventArgs e)
{
// Get this string from Database.
string fruits = "Mango,Apple,Banana,Pineapple,Orange,Lemon";
string[] aarry;
aarry = fruits.Split(',');
for (int i = 0; i <= aarry.Length; i++)
{
comboBox1.Items.Add(aarry[i]);
}
}
VB.Net
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
' Get this string from Database.
Dim fruits As String = "Mango,Apple,Banana,Pineapple,Orange,Lemon"
Dim aarry As String()
aarry = fruits.Split(","c)
For i As Integer = 0 To aarry.Length
comboBox1.Items.Add(aarry(i))
Next
End Sub
Screenshot
