Asp.net C# DowpdownListの初期値設定

Asp.net C# DowpdownListの初期値設定

ddlSelectCategory.DataBind();

int index = 0;

//Loop items Dropdown
foreach (ListItem item in ddlSelectCategory.Items)
{//found
if (item.Value.Trim() == s1.CategoryId.ToString().Trim())
{　//select item
ddlSelectCategory.SelectedIndex = index;
break;
}
index++;
}