Regarding Strongly Typed Dataset in Windows Form Application

Question

I am developing one simple invoice application in which I am having a simple Customer screen module.A Customer can have any number of GST records in  the Datagridview.The Screen is based on Customer Masters(Textboxes) and Customers Master Details(Datagridview) relationship through foreign keys. And I am Using Strongly Typed Dataset in this project as a xsd file.This Screen has 3 buttons i.e.New,Save and Find toolstrip menu.

 

When I start adding records after clicking on New Buttonstrip and and save ,it saves it successfully and when I press New Ideally it should clear the rows.The main issue here is that it is not clearing the rows??

I am enclosing the cs file here. 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace GST.Masters

{

public partial class Customers : Heptanesia.Winforms.Ui.Forms.MainUC

{

public static string recCode

{ get; set; }

public string RC;

public bool insertFlag;

public Data.GSTDb.CustomersRow r;

public Data.GSTDb.CustomersGSTNosRow gr;

public Data.GSTDb.CustomersDataTable dt = new Data.GSTDb.CustomersDataTable();

public Customers()

{

InitializeComponent();

recCode = Guid.NewGuid().ToString();

this.Load += new EventHandler(this.Customers_Load);

this.Ts.SaveClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.SaveClickedEventHandler(this.Ts_SaveClicked);

this.Ts.AddNewClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.AddNewClickedEventHandler(this.Ts_AddNewClicked);

this.Ts.SearchClicked += new Heptanesia.Winforms.Ui.Menu.ToolStrip.SearchClickedEventHandler(this.Ts_SearchClicked);

this.DgGST.CellValidated += (sender, e) =>

{

string name = this.DgGST.Columns[e.ColumnIndex].Name;

if (name == "DGCCountryCode")

{

name = this.DgGST.Rows[e.RowIndex].Cells[name].Value.ToString();

this.statesBindingSource.Filter = "ParentCode = '" + name + "'";

if (!this.FormIsLoading)

{

this.DgGST.Rows[e.RowIndex].Cells["DGCStateCode"].Value = null;

this.DgGST.Rows[e.RowIndex].Cells["DGCCityCode"].Value = null;

}

}

else if (name == "DGCStateCode")

{

name = this.DgGST.Rows[e.RowIndex].Cells[name].Value.ToString();

this.citiesBindingSource.Filter = "ParentCode = '" + name + "'";

if (!this.FormIsLoading)

{

this.DgGST.Rows[e.RowIndex].Cells["DGCCityCode"].Value = null;

}

}

};

}

private void Ts_AddNewClicked(object sender, EventArgs e)

{

this.gSTDb.Customers.Rows.Clear();

r = this.gSTDb.Customers.NewCustomersRow();

this.gSTDb.Customers.AddCustomersRow(r);

Data.GSTDbTableAdapters.CustomersGSTNosTableAdapter CGT = new Data.GSTDbTableAdapters.CustomersGSTNosTableAdapter();

CGT.FillByParentCode(gSTDb.CustomersGSTNos, r.RecCode);

}

private void Ts_SearchClicked(object sender, EventArgs e)

{

Heptanesia.Winforms.Ui.Forms.SearchForm sf = new Heptanesia.Winforms.Ui.Forms.SearchForm();

sf.DataSource = new Data.GSTDbTableAdapters.CustomersTableAdapter().GetData();

sf.DisplayColumns = new string[] { "Name" };

sf.DisplayHeaders = new string[] { "Customers Name" };

sf.DisplayWidths = new int[] { 200 };

if (sf.ShowDialog(this) == DialogResult.OK)

{

this.RC = sf.ReturnRow["RecCode"].ToString();

this.customersTableAdapter.FillByRecCode(this.gSTDb.Customers, RC);

}

}

private void Ts_SaveClicked(object sender, EventArgs e)

{

string message = "Error: ";

try

{

this.customersBindingSource.EndEdit();

//if (this.DgGST.CurrentRow.DataBoundItem != null)

this.fkCustomerGSTNosCustomersBindingSource.EndEdit();

if (this.gSTDb.Customers.HasErrors)

message += Classes.Global.SetBindingSourcePositionAndGetError(this.customersBindingSource, this.gSTDb.Customers.GetErrors()[0]);

else if (this.gSTDb.CustomersGSTNos.HasErrors)

message += Classes.Global.SetBindingSourcePositionAndGetError(this.fkCustomerGSTNosCustomersBindingSource, this.gSTDb.CustomersGSTNos.GetErrors()[0]);

else

{

this.gSTDb.Customers.BeforeSave();

this.gSTDb.CustomersGSTNos.BeforeSave();

Data.GSTDbTableAdapters.TableAdapterManager tm = new Data.GSTDbTableAdapters.TableAdapterManager();

tm.CustomersTableAdapter = this.customersTableAdapter;

tm.CustomersGSTNosTableAdapter = this.customersGSTNosTableAdapter;

tm.UpdateAll(this.gSTDb);

message = "Record(s) Saved Successfully";

}

}

catch (Exception ex)

{

message += ex.Message;

}

MessageBox.Show(message, "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

private void Customers_Load(object sender, EventArgs e)

{

this.FormIsLoading = true;

this.customersTableAdapter.Fill(this.gSTDb.Customers);

this.customersGSTNosTableAdapter.Fill(this.gSTDb.CustomersGSTNos);

this.countriesTableAdapter.Fill(this.gSTDb.Countries);

this.statesTableAdapter.Fill(this.gSTDb.States);

this.citiesTableAdapter.Fill(this.gSTDb.Cities);

this.gSTDb.Customers.Rows.Clear();

if (this.gSTDb.Customers.Rows.Count == 0)

{

Data.GSTDb.CustomersRow r = this.gSTDb.Customers.NewCustomersRow();

this.gSTDb.Customers.AddCustomersRow(r);

}

this.FormIsLoading = false;

}

private void DgGST_DataError(object sender, DataGridViewDataErrorEventArgs e)

{

if (e.Exception is ArgumentException)

{

object value = DgGST.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;

if (!((DataGridViewComboBoxColumn)DgGST.Columns[e.ColumnIndex]).Items.Contains(value))

{

((DataGridViewComboBoxCell)DgGST[e.ColumnIndex, e.RowIndex]).Value = DBNull.Value;

//((DataGridViewComboBoxColumn)dgv.Columns[e.ColumnIndex]).Items.Add(value);

e.ThrowException = false;

}

}

else

{

MessageBox.Show(e.Exception.Message);

e.Cancel = true;

}

}

}

}

 

Somebody Please Help.