Insert a New ListItem into SharePoint List using Server Side Code

SPWeb currentWeb = SPContext.Current.Web;

SPList lstLogin = currentWeb.Lists["Login"];

SPQuery sQuery = new SPQuery();

sQuery.Query = "<Where><Eq><FieldRef Name='UserName' /><Value

Type='Text'>"+txtUserName.Text.ToString().ToLower()+"</Value></Eq></Where>";

SPListItemCollection myColl = lstLogin.GetItems(sQuery);

if (myColl.Count > 0)

{

lblMessage.Text = "UserName Already Exists";

}

else

{

SPListItemCollection myColl1 = lstLogin.Items;

SPListItem item = myColl1.Add();

item["UserName"] = txtUserName.Text;

item["PassWord"] = txtPassWord.Text;

item.Update();