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this is my code........
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }

    protected void btnsave_Click(object sender, EventArgs e)
    {DataTable dt = new DataTable();
        
        DataRow dr;
       
        dt.Columns.Add(new System.Data.DataColumn("Name", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Address", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Cell", typeof(String)));



            dr = dt.NewRow();

            dr[0] = TextBox1.Text;
            dr[1] = TextBox2.Text;
            dr[2] = TextBox3.Text;
            dt.Rows.Add(dr);

            Session["CurrentData"] = dt;

            clearfields();
        
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Default3.aspx");

    }
    private void clearfields()
    {
        TextBox1.Text = "";
        TextBox2.Text = "";
        TextBox3.Text = "";
    
    
    }
}
Posted
Updated 19-Mar-12 0:37am
v2
Comments
Abhinav S 19-Mar-12 5:37am    
Code tags added.
Anuj Banka 19-Mar-12 5:45am    
dt = Session["CurrentData"];
dt.Rows.Add(dr);

before inserting second value.set

dt = Session["CurrentData"];
 
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Comments
rockpune 19-Mar-12 5:43am    
at which place i add this .......dt = Session["CurrentData"];
Anuj Banka 19-Mar-12 5:47am    
dt = Session["CurrentData"];
dt.Rows.Add(dr);
rockpune 19-Mar-12 5:48am    
i write like this

dt = (DataTable)Session["CurrentData"];

dr = dt.NewRow();

this is correct?
Anuj Banka 19-Mar-12 5:50am    
if (Session["CurrentData"] != null)
{
dt = (DataTable)Session["CurrentData"];
}
dt.Rows.Add(dr);
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }

    protected void btnsave_Click(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();
        if (Session["CurrentData"] != null)
        {
            dt = (DataTable)Session["CurrentData"];
        }
        DataRow dr;

        dt.Columns.Add(new System.Data.DataColumn("Name", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Address", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Cell", typeof(String)));



        dr = dt.NewRow();

        dr[0] = TextBox1.Text;
        dr[1] = TextBox2.Text;
        dr[2] = TextBox3.Text;
        dt.Rows.Add(dr);

        Session["CurrentData"] = dt;

        clearfields();


    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("Default3.aspx");

    }
    private void clearfields()
    {
        TextBox1.Text = "";
        TextBox2.Text = "";
        TextBox3.Text = "";


    }
}
 
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Comments
rockpune 19-Mar-12 5:54am    
getting this A column named 'Name' already belongs to this DataTable.
Anuj Banka 19-Mar-12 5:57am    
Then why you are creating datatable again create it only for first time as second time its taking from session or use this code after this code as i suggested.
Sushil Mate 19-Mar-12 6:05am    
Like this.. i haven't tried this.. check if it is working this way

DataTable dt;
if (Session["CurrentData"] != null)
{
dt = (DataTable)Session["CurrentData"];
}
else
{
DataTable dt = new DataTable();
}
Anuj Banka 19-Mar-12 6:10am    
DataTable dt; if (Session["CurrentData"] != null) { dt = (DataTable)Session["CurrentData"]; } else
{
DataTable dt = new DataTable();
dt.Columns.Add(new System.Data.DataColumn("Name", typeof(String)));
dt.Columns.Add(new System.Data.DataColumn("Address", typeof(String)));
dt.Columns.Add(new System.Data.DataColumn("Cell", typeof(String)));
}
You are not restoring the data table that you saved in session.

Try this

C#
private DataTable CreatEmptyDT()
{
    DataTable dt = new DataTable();

    dt.Columns.Add(new System.Data.DataColumn("Name", typeof(String)));
    dt.Columns.Add(new System.Data.DataColumn("Address", typeof(String)));
    dt.Columns.Add(new System.Data.DataColumn("Cell", typeof(String)));

    return dt;
}

public DataTable CurrentData
{
    get
    {
        object o = Session["CurrentData"];
        if (o == null)
            return CreatEmptyDT();
        else
            return (DataTable)o;
    }
    set { Session["CurrentData"] = value; }
}

protected void btnsave_Click(object sender, EventArgs e)
{
    DataTable dt = CurrentData;

    DataRow dr = dt.NewRow();

    dr[0] = TextBox1.Text;
    dr[1] = TextBox2.Text;
    dr[2] = TextBox3.Text;
    dt.Rows.Add(dr);

    CurrentData = dt;

    clearfields();
}



Cheers
 
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