public void table_row_add(int rem_n,DataRow drow)
{

//DataTable t_charge;
//t_charge = ds_charge.Tables[2];
DataRow newRow;
//newRow = t_charge.NewRow();
newRow = ds_charge.Tables[2].NewRow();

newRow[0] = drow[0];
newRow[1] = drow[1];
newRow[2] = drow[2];
newRow[3] = drow[3];
newRow[4] = rem_n;
newRow[5] = drow[5];
newRow[6] = drow[6];
newRow[7] = drow[7];
newRow[8] = drow[8];
newRow[9] = drow[9];
newRow[10] = drow[10];
newRow[11] = drow[11];
newRow[12] = drow[12];
newRow[13] = drow[13];
newRow[14] = drow[14];
//t_charge.Rows.Add(newRow);
//t_charge.AcceptChanges();
ds_charge.Tables[2].Rows.Add(newRow);
ds_charge.Tables[2].AcceptChanges();

//но результат один и тот же таблица пустая

}

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1
{
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.DataGrid dataGrid1;
		private System.Data.DataSet dataSet1;
		private System.Data.DataTable dataTable1;
		private System.Data.DataTable dataTable2;
		private System.Data.DataColumn dataColumn1;
		private System.Data.DataColumn dataColumn2;
		private System.Data.DataColumn dataColumn3;
		private System.Data.DataColumn dataColumn4;
		private System.Windows.Forms.Panel panel1;
		private System.Windows.Forms.Button button1;
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			InitializeComponent();
		}

		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		private void InitializeComponent()
		{
			this.dataGrid1 = new System.Windows.Forms.DataGrid();
			this.dataSet1 = new System.Data.DataSet();
			this.dataTable1 = new System.Data.DataTable();
			this.dataTable2 = new System.Data.DataTable();
			this.dataColumn1 = new System.Data.DataColumn();
			this.dataColumn2 = new System.Data.DataColumn();
			this.dataColumn3 = new System.Data.DataColumn();
			this.dataColumn4 = new System.Data.DataColumn();
			this.panel1 = new System.Windows.Forms.Panel();
			this.button1 = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.dataTable1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.dataTable2)).BeginInit();
			this.panel1.SuspendLayout();
			this.SuspendLayout();
			// 
			// dataGrid1
			// 
			this.dataGrid1.DataMember = "Table1";
			this.dataGrid1.DataSource = this.dataSet1;
			this.dataGrid1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
			this.dataGrid1.Location = new System.Drawing.Point(0, 32);
			this.dataGrid1.Name = "dataGrid1";
			this.dataGrid1.Size = new System.Drawing.Size(292, 234);
			this.dataGrid1.TabIndex = 0;
			// 
			// dataSet1
			// 
			this.dataSet1.DataSetName = "NewDataSet";
			this.dataSet1.Locale = new System.Globalization.CultureInfo("ru-RU");
			this.dataSet1.Tables.AddRange(new System.Data.DataTable[] { this.dataTable1, this.dataTable2});
			// 
			// dataTable1
			// 
			this.dataTable1.Columns.AddRange(new System.Data.DataColumn[] {this.dataColumn1, this.dataColumn2});
			this.dataTable1.TableName = "Table1";
			// 
			// dataTable2
			// 
			this.dataTable2.Columns.AddRange(new System.Data.DataColumn[] { this.dataColumn3, this.dataColumn4});
			this.dataTable2.TableName = "Table2";
			// 
			// dataColumn1
			// 
			this.dataColumn1.ColumnName = "Column1";
			this.dataColumn1.DataType = typeof(short);
			// 
			// dataColumn2
			// 
			this.dataColumn2.ColumnName = "Column2";
			// 
			// dataColumn3
			// 
			this.dataColumn3.Caption = "Наименование объекта";
			this.dataColumn3.ColumnName = "Column1";
			// 
			// dataColumn4
			// 
			this.dataColumn4.ColumnName = "Column2";
			this.dataColumn4.DataType = typeof(short);
			// 
			// panel1
			// 
			this.panel1.Controls.Add(this.button1);
			this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
			this.panel1.Location = new System.Drawing.Point(0, 0);
			this.panel1.Name = "panel1";
			this.panel1.Size = new System.Drawing.Size(292, 32);
			this.panel1.TabIndex = 1;
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(16, 8);
			this.button1.Name = "button1";
			this.button1.TabIndex = 0;
			this.button1.Text = "Выбор";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 266);
			this.Controls.Add(this.dataGrid1);
			this.Controls.Add(this.panel1);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.dataTable1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.dataTable2)).EndInit();
			this.panel1.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			Form2 fm=new Form2(dataSet1);
			fm.ShowDialog();
		}
	}
}

using System;
using System.Data;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsApplication1
{
	public class Form2 : System.Windows.Forms.Form
	{
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.DataGrid dataGrid1;
		private System.Windows.Forms.Panel panel1;
		private System.Windows.Forms.Button Sel;
		private DataSet myDataSet;

		public Form2(DataSet ds)
		{
			myDataSet=ds;
			InitializeComponent();
			dataGrid1.DataSource=myDataSet;
			dataGrid1.DataMember="Table2";

		}

		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		private void InitializeComponent()
		{
			this.dataGrid1 = new System.Windows.Forms.DataGrid();
			this.panel1 = new System.Windows.Forms.Panel();
			this.Sel = new System.Windows.Forms.Button();
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
			this.panel1.SuspendLayout();
			this.SuspendLayout();
			// 
			// dataGrid1
			// 
			this.dataGrid1.DataMember = "";
			this.dataGrid1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
			this.dataGrid1.Location = new System.Drawing.Point(0, 40);
			this.dataGrid1.Name = "dataGrid1";
			this.dataGrid1.Size = new System.Drawing.Size(320, 206);
			this.dataGrid1.TabIndex = 0;
			// 
			// panel1
			// 
			this.panel1.Controls.Add(this.Sel);
			this.panel1.Dock = System.Windows.Forms.DockStyle.Top;
			this.panel1.Location = new System.Drawing.Point(0, 0);
			this.panel1.Name = "panel1";
			this.panel1.Size = new System.Drawing.Size(320, 40);
			this.panel1.TabIndex = 1;
			// 
			// Sel
			// 
			this.Sel.Location = new System.Drawing.Point(16, 8);
			this.Sel.Name = "Sel";
			this.Sel.TabIndex = 0;
			this.Sel.Text = "Выбрать";
			this.Sel.Click += new System.EventHandler(this.Sel_Click);
			// 
			// Form2
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(320, 246);
			this.Controls.Add(this.dataGrid1);
			this.Controls.Add(this.panel1);
			this.Name = "Form2";
			this.Text = "Form2";
			this.Load += new System.EventHandler(this.Form2_Load);
			((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
			this.panel1.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		private void Form2_Load(object sender, System.EventArgs e)
		{
			for (int i=0;i<10;i++)
			{
				DataRow row=myDataSet.Tables["Table2"].NewRow();
				row["Column1"]="row "+i.ToString();
				row["Column2"]=i;
				myDataSet.Tables["Table2"].Rows.Add(row);
				
			}
		   myDataSet.Tables["Table2"].AcceptChanges();
		 
		}


		private void Sel_Click(object sender, System.EventArgs e)
		{
		
			DataRowView r = (DataRowView)DataGrid1.BindingContext
                                      [dataGrid1.DataSource, dataGrid1.DataMember].Current;
			//MessageBox.Show(r["Column2"].ToString());
			DataRow newRow;
			newRow = myDataSet.Tables["Table1"].NewRow();

			newRow["Column2"] = Convert.ToString(r["Column1"]);
			newRow["Column1"] = Convert.ToInt16(r["Column2"])+10;
			myDataSet.Tables["Table1"].Rows.Add(newRow);
			myDataSet.Tables["Table1"].AcceptChanges();
			this.Close();
		}
	}
}