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How to get row data by clicking a image button in a row in an ASP.NET gridview

I have a GridView in a ASP.NET web application, in which I have added image button in each row:
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="edit" runat="server" CommandArgument='<%# Bind("EmpID") %>' CommandName="edituser" ImageUrl="image/images.jpg"
ToolTip="Edit User Details"> </asp:ImageButton>
</ItemTemplate>
</asp:TemplateField>
Now how I can get the row data from gridview simply by clicking an edit image button in a row?

You have to change the CommandArgument with this one:
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>
Then:
protected void GridView1_RowCommand(object sender,
GridViewCommandEventArgs e)
{
if (e.CommandName == "edituser") /*if you need this
{
// Retrieve the row index stored in the
// CommandArgument property.
int index = Convert.ToInt32(e.CommandArgument);
// Retrieve the row that contains the buttonfrom the Rows collection.
GridViewRow row = GridView1.Rows[index];
// Add code here now you have the specific row data
}
}

Bind all the columns in the label control respectively, and you can get value using findcontrol method at GridView1_SelectedIndexChanged event
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
Label _lblText = (Label)this.GridView1.SelectedRow.FindControl("UR_Desired_Label_ID");
this.TextBox3.Text = _lblText.Text ;
}

Change value of asp:BoundField as page loads

I have the following:
<Columns>
...
<asp:BoundField DataField="datetime_added" HeaderText="When Added" ReadOnly="True" SortExpression="datetime_added" />
...
</Columns>
The DataField datetime_added comes from a SQL Data Source. I want to do some editing of every value for this column after the values are queried from the SQL Data Source on the C# side. Kind of like:
//short pseudo code example
protected void someEvent(object sender, EventArgs e)
{
sender.GetField["datetime_added"] = "test";
}
Is there a way to do this?

use a templatefield instead of a boundfield
- with a label
- the label text is fed by a function throught something like this:
<asp:GridView ID="GridView1" runat="server" EnableModelValidation="True">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label runat="server" Text='<%= SomeFunction(Eval("db_id"),Eval("description")) %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And this in your code behind:
protected string SomeFunction(object id, object description)
{
//your code
return "";
}
When your function is called, the field from SQL is passed as an object
so that you can use it if you want or return something else based on whatever you want.
The function is called when the value is bound from the datasource in each row, you'll probably need to pass an id as well to identify the row.

Have you tried the "OnRowCreated" event? I'm assuming here that you're using a GridView, and if not, then there may be something similar in whatever component it is you're binding the data to.
For GridView, here is an example:
protected void gridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
// do what you need in here
// e.Row.Cells[x] where x = the column number
}
}
Also, this method can be really slow depending on how many rows you're processing.

If you are using RowDataBound event to manipulate the values before it's being bound to the grid (getting called while binding every row to the gridview)
protected void Gridview1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
string datetimeadded = DataBinder.Eval(e.Row.DataItem, "datetime_added").ToString();
// or you can use the cell index to reference the boundfield like below
string datetimeadded = e.Row.Cells[1].Text;
}
}

How to delete a row without using OnRowDeleted/OnRowDeleting in gridview

Code Behind
public void lbDelete_Click(object sender, EventArgs e)
{
LinkButton lb = sender as LinkButton;
GridViewRow gvrow = lb.NamingContainer as GridViewRow;
gvsize.DeleteRow(gvrow.RowIndex);
}
GridView:
<asp:GridView ID="gvsize" runat="server" ShowFooter="True" CellPadding="1" CellSpacing="2" AutoGenerateColumns="false" GridLines="Horizontal">
<asp:TemplateField HeaderText="Action">
<ItemTemplate>
<asp:LinkButton ID="lnkdelete" runat="server" ForeColor="Blue" OnClick="lbDelete_Click">Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</asp:GridView >
There are 2 rows in my gridview which I need to delete the row using the function above.
It throws an error "gvsize" RowDeletingEvent was not handled properly.
Is that necessary to use OnRowDeleted/OnRowDeleting in gridview which I feel not necessary??

As stated in How to delete row from gridview?
You are deleting the row from the gridview but you are then going and
calling databind again which is just refreshing the gridview to the
same state that the original datasource is in.
Either remove it from the datasource and then databind, or databind
and remove it from the gridview without redatabinding.
You can use row databound event to accomplish this task.
<asp:LinkButton ID="lnkBtnDel" runat="server" CommandName="DeleteRow" OnClientClick="return confirm('Are you sure you want to Delete this Record?');"">Delete</asp:LinkButton>
and in the rowdatabound event you can have
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "DeleteRow")
{
//incase you need the row index
int rowIndex = ((GridViewRow)((LinkButton)e.CommandSource).NamingContainer).RowIndex;
//followed by your code
}
}

Try this to delete row
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
dt.Rows.RemoveAt(e.RowIndex);
GridView1.DataSource = dt;
GridView1.DataBind();
}
You can also delete row from another method using Template Column
ASPX
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:ImageButton ID="imgDelete" runat="server" CommandName="deletenotice" ImageUrl="~/images/delete1.gif" alt="Delete"
OnClientClick="return confirm('Are you sure want to delete the current record ?')">
</asp:ImageButton>
</ItemTemplate>
</asp:TemplateField>
C# Code
protected void gvNoticeBoardDetails_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.ToLower().Equals("deletenotice"))
{
GridViewRow row = (GridViewRow)(((ImageButton)e.CommandSource).NamingContainer);
NoticeBoard notice = new NoticeBoard();
HiddenField lblCust = (HiddenField)row.FindControl("hdngvMessageId");//Fetch the CourierId from the selected record
auditTrail.Action = DBAction.Delete;
Service simplyHRClient = new Service();
MessageClass messageClass = simplyHRClient.SaveNoticeBoard(notice, auditTrail);
if (messageClass.IsSuccess)
{
this.Page.AddValidationSummaryItem(messageClass.MessageText, "save");
showSummary.Style["display"] = string.Empty;
showSummary.Attributes["class"] = "success-message";
if (messageClass.RecordId != -1)
lblCust.Value = messageClass.RecordId.ToString();
}
else
{
this.Page.AddValidationSummaryItem(messageClass.MessageText, "save");
showSummary.Style["display"] = string.Empty;
showSummary.Attributes["class"] = "fail-message";
}
//Bind Again grid
GetAllNoticeBoard();
}
}
Hope it helps you

How to get selected item from Dropdown in GridView?

I have a GridView. Whenever I'm clicking on the LinkButton after selecting the Dropdown value, I'm getting only the first item of the Dropdown.
I need to show the selected value in TextBox. How can i get the desired value ?
This is my pseudo code:
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" EnableModelValidation="True"
OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%#Eval("ID")%>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Count">
<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server" EnableViewState="true" AutoPostBack="false">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Button">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">LinkButton</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
And the code behind:
protected void Page_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("ID", typeof(string));
dt.Columns.Add("Count", typeof(string));
dt.Rows.Add("A", "5");
dt.Rows.Add("B", "8");
dt.Rows.Add("C", "4");
dt.Rows.Add("D", "7");
dt.Rows.Add("E", "9");
GridView1.DataSource = dt;
GridView1.DataBind();
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = (DropDownList)e.Row.FindControl("DropDownList1");
ddl.Items.Clear();
int count = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Count").ToString());
List<string> list = new List<string>();
for (int i = 1; i <= count; i++)
{
list.Add(i.ToString());
}
ddl.DataSource = list;
ddl.DataBind();
}
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
GridViewRow grdrow = (GridViewRow)((LinkButton)sender).NamingContainer;
DropDownList ddl = (DropDownList)GridView1.Rows[grdrow.RowIndex].FindControl("DropDownList1");
TextBox1.Text = ddl.SelectedValue.ToString();
}
Thanks in advance...

I'm going to guess that you should implement INotifyProperty change with the databinding. This way every change will be recorded including those made after first change in the drop down box. see ~ http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged.aspx

Since you are dynamically creating and binding the Dropdownlist, it would not have loaded at the point your click event is executed. For you to use bound properties (the selectedValue property in this case), the control must already be loaded and it's viewstate info parsed and set by the control.
The databinding event that creates the dropdownlist runs after pre-render. See http://msdn.microsoft.com/en-us/library/ms178472%28v=vs.85%29.aspx for details on the page lifecycle.
To do what you are asking requires very close attention to the page life cycle. Try moving the code that sets the textbox to the GridView1_RowDataBound method. For this to work though, your control must be rendered with the same properties everytime (that way the event's on it are wired up correctly and the selectedValue property is set correctly).
Another alternative is to handle events on the textbox or dropdownlist itself. You would again have to pay attention to the properties and lifecycle of the control.
ASP.Net Forms uses the SmartUI pattern and IMHO this is the single greatest knock against this pattern.

Ok, try this
protected void LinkButton1_Click(object sender, EventArgs e)
{
LinkButton lnkBtn = (LinkButton)sender;
GridViewRow row = (GridViewRow)lnkBtn.NamingContainer;
DropDownList ddl= (DropDownList)row.FindControl("DropDownList1");
TextBox1.Text = ddl.SelectedValue.ToString();
}

DropDownList in GridView asp.net

I want to add a dropdownlist to every entry in a gridview.
<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns="False"
onselectedindexchanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:TemplateField HeaderText="Bank">
<ItemTemplate>
<asp:DropDownList ID="DropDown"
AutoPostBack="true" runat="server" DataTextField="Name" DataValueField="Name"
>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
At the back end i have the following code in order to bind a datatable to that dropdown list.
DataTable reader = BusinessLayer.BusinessLayerHandler.GetBankList();
DropDown.DataSource = reader;
DropDown.DataTextField = "NAME";
DropDown.DataValueField = "NAME";
DropDown.DataBind();
My problem is that the drop down list created at the grid view (DropDown) is not found at the back end as if it doesn't exist..
What can I do?

The DropDownList will be created for every single item in the GridView, so there can't be one field for the dropdownlists. Nevertheless, you can retrieve the DropDownList for a single row (e.g. in RowDataBound or RowCreated event)
protected void grid_RowDataBound(object sender, GridViewRowEventArgs e)
{
if(r.Row.RowType == DataControlRowType.DataRow)
{
DropDownList dropdown = e.Row.FindControl("DropDown") as DropDownList;
if(dropdown != null)
{ /* your code */ }
}
}
Or you can use an event of the DropDownList itself and access the sender parameter.
<asp:DropDownList ID="DropDown" OnLoad="dropdownLoad" />
protected void dropdownLoad(object sender, EventArgs e)
{
DropDownList dropdown = sender as DropDownList;
if(dropdown != null)
{ /* your code */ }
}

you can find dropdown into grid databound event by grid.findcontrol.