it gives me error in GetLoginDataSet The SqlParameter is already contained by another SqlParameterCollection.

protected void btnSave_Click(object sender, ImageClickEventArgs e)
        {
            try 
            {
                DataSet ds = new DataSet();
                //objLogin.Mode = 2;
                objLogin.LoginId = Convert.ToInt32(Session["LoginId"].ToString());
                ds = objLogin.GetLoginDataSet();
                if (ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
                {
                    if (txtOldPassword.Text == ds.Tables[0].Rows[0]["Password"].ToString())
                    {
                        string ABC = txtNewPassword.Text;
                        if (txtConfirmPwd.Text == ABC)
                        {
                            objLogin.Password = txtNewPassword.Text;
                            objLogin.ConfirmPassword = txtConfirmPwd.Text;
                            objLogin.LoginId = Convert.ToInt32(Session["LoginId"].ToString());
                            objLogin.IsActive = 1;
                            objLogin.IsDeleted = 0;
                            objLogin.UpdatedBy = Convert.ToInt32(Session["LoginId"].ToString());
                            objLogin.UpdatedDate = Convert.ToDateTime(System.DateTime.Today.ToString()).ToString("yyyy/MM/dd");
                            int result = objLogin.InsertPwdData();
                            if (result > 0)
                            {
                                txtNewPassword.Text = string.Empty;
                                txtConfirmPwd.Text = string.Empty;
                                txtOldPassword.Text = string.Empty;
                                ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('Password Changed Sucessfully');", true);
                            }
                            else
                            {
                                ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('Data not Saved');", true);
                            }
                        }
                        else 
                        {
                            ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('Password Doesn't Match');", true);
                        }
                    }
                    else
                    {
                        ScriptManager.RegisterStartupScript(this, this.GetType(), "msg", "alert('Current Password is Incorrect');", true);
                    }                   
                }
            }
            catch { }
        }       
public DataSet GetLoginDataSet()
        {
            try
            {
                SqlParameter[] P = new SqlParameter[3];
                P[0] = new SqlParameter("@LoginId", LoginId);
                P[1] = new SqlParameter("@LoginName", LoginName);
                P[2] = new SqlParameter("@Password", Password);
                //return sqlHelper.ExecuteDataset(ClsConnection.ConnectionString, "Select Password from LoginMaster where LoginId='" + LoginId + "'", P);
                return sqlHelper.ExecuteDataset(ClsConnection.ConnectionString, CommandType.StoredProcedure, "SP_LoginMaster", P);    
            }
            catch
            {
                return null;
            }
        }