Where to write code for button event handler in a GridView

Originally Posted by adityakoppolu

i am giving sample code impliment it in your own way

add this in aspx

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="111px" >
<Columns>
<asp:ButtonField ButtonType="Button" Text="Button" />
<asp:BoundField HeaderText="Time" DataField="Time" />

</Columns>
</asp:GridView>

add this in aspx.cs page

protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("Time");

DataRow dr = dt.NewRow();

dr["Time"] = DateTime.Now.ToString();

dt.Rows.Add(dr);

GridView1.DataSource = dt;
GridView1.DataBind();

}

Originally Posted by adityakoppolu

Tyr with this

in aspx

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="111px"
OnSelectedIndexChanged="GridView1_SelectedIndexCha nged">
<Columns>
<asp:CommandField ButtonType="Button" ShowSelectButton="True" />
<asp:BoundField HeaderText="Time" DataField="Time" />
</Columns>
</asp:GridView>


in aspx.cs page

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Actual you need to write your main logic here to get data into table
// if you are collecting data through query
// write in query like select *,getdate() as Time form tablename .....
//so will get the column name extra as "Time"

DataTable dt = new DataTable();
dt.Columns.Add("Time");

DataRow dr = dt.NewRow();
dr["Time"] = DateTime.Now.ToString();
dt.Rows.Add(dr);

DataRow dr1 = dt.NewRow();
dr1["Time"] = DateTime.Now.ToString();
dt.Rows.Add(dr1);

DataRow dr2 = dt.NewRow();
dr2["Time"] = DateTime.Now.ToString();
dt.Rows.Add(dr2);

GridView1.DataSource = dt;
GridView1.DataBind();

ViewState["table"] = dt;
}

}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
DataTable dtGV = (DataTable)ViewState["table"];

dtGV.Rows[GridView1.SelectedIndex]["Time"] = DateTime.Now.ToString();

dtGV.Rows[GridView1.SelectedIndex].AcceptChanges();

GridView1.DataSource = dtGV;
GridView1.DataBind();

ViewState["table"] = dtGV;
}

Originally Posted by adityakoppolu

To show modifications/updations in the grid normally we will update in the table and then bind that table to grid. This is easy insted of doing on grid. why bcoz if we bind our grid with table/dataset once again the modifications which are doing on grid will be lost. Grid will freshly rebind the rows and columns which are in table/dataset. if we are doing on grid directly we need to find the exact control and need to update that one.
I dont know in which process you r doing. So i have given like that.i think its better to add item template with lable control to your grid as bellow

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="111px"
OnSelectedIndexChanged="GridView1_SelectedIndexCha nged">
<Columns>
<asp:CommandField ButtonType="Button" ShowSelectButton="True" />

<asp:TemplateField HeaderText="time label">
<ItemTemplate>
<asp:Label ID="lbltime" runat="server" />
</ItemTemplate>
</asp:TemplateField>

on selected index change of grid find that control and update that control as bellow . Dont bind grid again with table/dataset. Bcoz it will lose the data.

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
Label lblTime = ((Label)GridView1.Rows[GridView1.SelectedIndex].Cells[1].FindControl("lbltime"));
//Here Cells[1] is 2nd column "time label"
lblTime.Text = DateTime.Now.ToString();
}