Updating database table rows using datagrid dynamically

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Dear code project members i need your kind attention towards one on the problem I am facing:-

i need to display a database table records in gridview and update a choosen record dynamically. when i edit the record and press update nothing is happening.

the complate code of the page is:

SQL

CREATE TABLE [dbo].[tbeng](
    [engid] [int] IDENTITY(1,1) NOT NULL,
    [engnam] [varchar](50) NULL,
    [engeml] [varchar](50) NULL,
)

XML

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Configuration" %>

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

<script runat="server">

            SqlConnection con;
            SqlCommand com ;
            SqlDataAdapter da = new SqlDataAdapter();
            DataTable taskTable = new DataTable("TaskList");

    protected void Page_Load(object sender, EventArgs e)
    {
            con = new SqlConnection(ConfigurationManager.ConnectionStrings["cn"].ConnectionString);

            com = new SqlCommand("SELECT [engid],[engnam],[engeml] FROM [dbCMS].[dbo].[tbeng]", con);
            com.Connection = con;
            da.SelectCommand = com;

            var builder = new SqlCommandBuilder(da);
            da.UpdateCommand = builder.GetUpdateCommand(true);

            da.Fill(taskTable);

            Session["TaskTable"] = taskTable;

            BindData();
    }

    protected void TaskGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        TaskGridView.PageIndex = e.NewPageIndex;
        BindData();
    }

    protected void TaskGridView_RowEditing(object sender, GridViewEditEventArgs e)
    {
        TaskGridView.EditIndex = e.NewEditIndex;
        BindData();
    }

    protected void TaskGridView_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        TaskGridView.EditIndex = -1;
        BindData();
    }

    protected void TaskGridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        DataTable dt = (DataTable)Session["TaskTable"];

        GridViewRow row = TaskGridView.Rows[e.RowIndex];

        dt.Rows[row.DataItemIndex]["engid"] = ((TextBox)(row.Cells[1].Controls[0])).Text;
        dt.Rows[row.DataItemIndex]["engnam"] = ((TextBox)(row.Cells[2].Controls[0])).Text;
        dt.Rows[row.DataItemIndex]["engeml"] = ((TextBox)(row.Cells[3].Controls[0])).Text;

        da.Update(dt);

        TaskGridView.EditIndex = -1;

        BindData();
    }

    private void BindData()
    {
        TaskGridView.DataSource = Session["TaskTable"];
        TaskGridView.DataBind();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
     <div>

      <asp:GridView ID="TaskGridView" runat="server"

        AutoGenerateEditButton="True"
        AllowPaging="true"
        OnRowEditing="TaskGridView_RowEditing"
        OnRowCancelingEdit="TaskGridView_RowCancelingEdit"
        OnRowUpdating="TaskGridView_RowUpdating"
        OnPageIndexChanging="TaskGridView_PageIndexChanging" >
      </asp:GridView>

    </div>

    </form>
</body>
</html>

Posted 25-Jun-12 23:54pm

vijay tkakur progchd

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pradiprenushe · Answer 1 · 2012-06-26T00:27:00

Solution 1

I think data is updating but you are not taking updated data. You are binding grid from session. This session should be updated or select part from Page_Load should be moved to BindData method.

Posted 26-Jun-12 0:27am

pradiprenushe

Raghuveer Kasyap · Answer 2 · 2012-06-26T01:54:00

Hi,

C#

private void BindData()
    {
        TaskGridView.DataSource = Session["TaskTable"];
        TaskGridView.DataBind();
    }

Instead of above code write the code below.

C#

private void BindData()
    {
        TaskGridView.DataSource =(DataTable) Session["TaskTable"];
        TaskGridView.DataBind();
    }

Regards,
Raghu