How to fetch row records on a button click

Deepak Dwij

Hi,
Suppose we have a table name 'emp' in Sql server having 4 fields in that, having four TextBoxes and a button click name as Next in the aspx Or Windows form then i want to know that on a next button click event, the values in the TextBoxes fetches a new row from the emp table on every click.

2 Replies

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Senthilkumar14y ago

Hi,

I have designed the page what you expect.

Instead of fetching from database, i have created the datatable. You can write the sql connection to load the data table.

Design Page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ShowRecords.aspx.cs" Inherits="Corner_ShowRecords" %>

Untitled Page

Employee Name:
Address:
City:
State:
Width="58px" /> onclick="btnPrevious_Click" /> Text="Next" onclick="btnNext_Click" Width="60px" /> ID="btnLast" runat="server" Text="Last" onclick="btnLast_Click" Width="57px" />

Code File:

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

GenerateTable();

Session["CurrentPage"] = "0";

LoadPage(0);

}

private void LoadPage(int position)

{

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

if(dt.Rows.Count > 0)

{

DataRow dRow = dt.Rows[position];

txtName.Text = dRow["Name"].ToString();

txtAddress.Text = dRow["Address"].ToString();

txtCity.Text = dRow["City"].ToString();

txtState.Text = dRow["State"].ToString();

}

Session["CurrentPage"] = position.ToString();

}

protected void btnPrevious_Click(object sender, EventArgs e)

{

int currentPage = Convert.ToInt32(Session["CurrentPage"].ToString());

if (currentPage > 0)

{

LoadPage(currentPage - 1);

}

protected void btnNext_Click(object sender, EventArgs e)

{

int currentPage = Convert.ToInt32(Session["CurrentPage"].ToString());

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

if (currentPage < dt.Rows.Count-1)

{

LoadPage(currentPage + 1);

}

protected void btnFirst_Click(object sender, EventArgs e)

{

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

if (dt.Rows.Count > 0)

{

LoadPage(0);

}

protected void btnLast_Click(object sender, EventArgs e)

{

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

if (dt.Rows.Count > 0)

{

LoadPage(dt.Rows.Count - 1);

}

private DataTable GenerateTable()

{

DataTable dTable = new DataTable();

DataColumn dColumn = null;

DataRow dRow = null;

dColumn = new DataColumn();

dColumn.ColumnName = "SNO";

dColumn.AutoIncrement = true;

dColumn.AutoIncrementSeed = 1;

dColumn.AutoIncrementStep = 1;

dTable.Columns.Add(dColumn);

dColumn = new DataColumn();

dColumn.ColumnName = "Name";

dTable.Columns.Add(dColumn);

dColumn = new DataColumn();

dColumn.ColumnName = "Address";

dTable.Columns.Add(dColumn);

dColumn = new DataColumn();

dColumn.ColumnName = "City";

dTable.Columns.Add(dColumn);

dColumn = new DataColumn();

dColumn.ColumnName = "State";

dTable.Columns.Add(dColumn);

dRow = dTable.NewRow();

dRow["Name"] = "Senthil";

dRow["Address"] = "Bangalore";

dRow["City"] = "Bangalore";

dRow["State"] = "Karnataka";

dTable.Rows.Add(dRow);

dRow = dTable.NewRow();

dRow["Name"] = "Praveen";

dRow["Address"] = "Raman nagar";

dRow["City"] = "Chennai";

dRow["State"] = "Tamilnadu";

dTable.Rows.Add(dRow);

dRow = dTable.NewRow();

dRow["Name"] = "Vinay";

dRow["Address"] = "Bangalore";

dRow["City"] = "Bangalore";

dRow["State"] = "Karnataka";

dTable.Rows.Add(dRow);

dRow = dTable.NewRow();

dRow["Name"] = "Sanjay";

dRow["Address"] = "Shivaji nagar";

dRow["City"] = "Mumbai";

dRow["State"] = "Maharastra";

dTable.Rows.Add(dRow);

dRow = dTable.NewRow();

dRow["Name"] = "Neetu";

dRow["Address"] = "Pricad";

dRow["City"] = "Delhi";

dRow["State"] = "New Delhi";

dTable.Rows.Add(dRow);

Session["UsersTable"] = dTable;

return dTable;

}

Screenshot:

Hope this will help you.

Satyapriya Nayak14y ago
Hi Deepak,

Try this...

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Untitled Pagetitle>

head>

<body>

    <form id="form1" runat="server">

    <div>

      <asp:Label ID="Label1" runat="server" Text="ID" Width="80">asp:Label>

        <asp:TextBox ID="TextBox1" runat="server">asp:TextBox><br />

        <asp:Label ID="Label2" runat="server" Text="Name" Width="80">asp:Label>

        <asp:TextBox ID="TextBox2" runat="server">asp:TextBox><br />

        <asp:Label ID="Label3" runat="server" Text="Address" Width="80">asp:Label>

        <asp:TextBox ID="TextBox3" runat="server">asp:TextBox><br />

        <asp:Label ID="Label4" runat="server" Text="Marks" Width="80">asp:Label>

        <asp:TextBox ID="TextBox4" runat="server">asp:TextBox><br />

        <asp:Label ID="Label5" runat="server" Text="Year" Width="80">asp:Label>

        <asp:TextBox ID="TextBox5" runat="server">asp:TextBox><br />

       <asp:Button ID="btnfirst" runat="server" Text="First" Width="60px"

            onclick="btnfirst_Click" />

        <asp:Button ID="btnprevious" runat="server" Text="Previous" Width="60px"

            onclick="btnprevious_Click" />

        <asp:Button ID="btnnext" runat="server" Text="Next" Width="60px"

            onclick="btnnext_Click"/>

        <asp:Button ID="btnlast" runat="server" Text="Last" Width="60px"

            onclick="btnlast_Click"/><br />

        <asp:GridView ID="GridView1" runat="server">

        asp:GridView>

    div>

    form>

body>

html>

using System;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

    string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

    SqlCommand com;

    SqlDataAdapter sqlda;

    string str;

    static DataSet ds;

    static DataTable dt;

    static int r1;

    static int r2;

    protected void Page_Load(object sender, EventArgs e)

    {

        SqlConnection con = new SqlConnection(connStr);

        try

        {

            if (!IsPostBack)

            {

                con.Open();

                str = "select * from student";

                com = new SqlCommand(str, con);

                sqlda = new SqlDataAdapter(com);

                ds = new DataSet();

                sqlda.Fill(ds, "student");

                dt = ds.Tables["student"];

                r1 = dt.Rows.Count;

                if (r1 > 0)

                {

                    showfirst();

                }

                r2 = 0;

            }

        }

        catch (Exception ex)

        {

            Response.Write(ex.Message);

        }

        con.Close();

        bindgrid();

    }

    public void bindgrid()

    {

        SqlConnection con = new SqlConnection(connStr);

        con.Open();

        str = "select * from student";

        com = new SqlCommand(str, con);

        sqlda = new SqlDataAdapter(com);

        ds = new DataSet();

        sqlda.Fill(ds, "student");

        GridView1.DataSource = ds;

        GridView1.DataMember = "student";

        GridView1.DataBind();

        con.Close();

    }

    public void showfirst()

    {

        TextBox1.Text = dt.Rows[0].ItemArray[0].ToString();

        TextBox2.Text = dt.Rows[0].ItemArray[1].ToString();

        TextBox3.Text = dt.Rows[0].ItemArray[2].ToString();

        TextBox4.Text = dt.Rows[0].ItemArray[3].ToString();

        TextBox5.Text = dt.Rows[0].ItemArray[4].ToString();

    }

    protected void btnfirst_Click(object sender, EventArgs e)

    {

        showfirst();

    }

    protected void btnprevious_Click(object sender, EventArgs e)

    {

        SqlConnection con = new SqlConnection(connStr);

        try

        {

            if (r2 > 0)

            {

                r2 -= 1;

                TextBox1.Text = dt.Rows[r2].ItemArray[0].ToString();

                TextBox2.Text = dt.Rows[r2].ItemArray[1].ToString();
                TextBox3.Text = dt.Rows[r2].ItemArray[2].ToString();
                TextBox4.Text = dt.Rows[r2].ItemArray[3].ToString();

                TextBox5.Text = dt.Rows[r2].ItemArray[4].ToString();
            }

        }

        catch (Exception ex)

        {

            Response.Write(ex.Message);

        }

        finally

        {

            con.Close();

        }

    }

    protected void btnnext_Click(object sender, EventArgs e)

    {

        try

        {

            if (r2 < r1)

            {

                r2 += 1;

                TextBox1.Text = dt.Rows[r2].ItemArray[0].ToString();
                TextBox2.Text = dt.Rows[r2].ItemArray[1].ToString();
                TextBox3.Text = dt.Rows[r2].ItemArray[2].ToString();
                TextBox4.Text = dt.Rows[r2].ItemArray[3].ToString();
                TextBox5.Text = dt.Rows[r2].ItemArray[4].ToString();
            }

        }

        catch (Exception ex)

        {

            Response.Write(ex.Message);

        }

    }

    protected void btnlast_Click(object sender, EventArgs e)

    {

        try

        {

            TextBox1.Text = ds.Tables["student"].Rows[r1 - 1].ItemArray[0].ToString();
            TextBox2.Text = ds.Tables["student"].Rows[r1 - 1].ItemArray[1].ToString();
            TextBox3.Text = ds.Tables["student"].Rows[r1 - 1].ItemArray[2].ToString();
            TextBox4.Text = ds.Tables["student"].Rows[r1 - 1].ItemArray[3].ToString();
            TextBox5.Text = ds.Tables["student"].Rows[r1 - 1].ItemArray[4].ToString();

        }

        catch (Exception ex)

        {

            Response.Write(ex.Message);

        }

    }

}

Thanks
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