Delete ListItem in the SharePoint List using Server Side Code

if (txtUserName.Text != "")

{

       SPWeb currentWeb = SPContext.Current.Web;

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

       SPListItemCollection myColl = lstLogin.Items;

       foreach (SPListItem item in myColl)

       {

              if (item["UserName"].ToString() == txtUserName.Text)

              {

                     item["PassWord"] = txtPassWord.Text;

                     item.Delete();

                     lblMessage.Text = "Deletion Successful";

                     Clear();

                     break;

              }

       }

}

Note:-

Here The above are having clear function here i am keeping the Clear function

public void Clear()

{

       txtUserName.Text = "";

       txtPassWord.Text = "";

       txtUserName.Focus();

}