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How to replace text in some cells of GridView after data binding?

I have a GridView that is assosiated with database. Here's a data binding:
protected void GridViewProgramms_SelectedIndexChanged(object sender, EventArgs e)
{
int rowIndex = ((GridView) sender).SelectedIndex;
var programid = ((GridView) sender).Rows[rowIndex].Cells[1].Text;
GridViewEx.RowEditing += GridViewEx_RowEditing;
SqlDataSource1.SelectParameters["ID"].DefaultValue = programid;
GridViewEx.DataBind();
ExcersicePanel.Visible = true;
PanelAp.Visible = false;
}
Everything works fine, but I need to change some cells values in GridView after that. I need to rewrite every Cell in the last row. How to do this without affecting the database?

You will need to write your code(To change the cell text) in RowDataBound event of the gridview after data bind
Refer following link for more explanation
Update GridView Column after databinding

protected void GridViewEx_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
label or textbox ddltype = (label or textbox)e.Row.FindControl("id");
ddltype.text="ur text";
}
}

How to change the color of label depending on certain values in the gridview

I have a sqldatasource and gridview.
I have two columns:
ID | Status
1 Closed
2 Opened
3 Waiting
How to change the color of the label in the view state of the gridview depeding on the value from the 'status' column.
For example if the value in the cell is "Closed" the label color will be red , if it's opened then it will become green and so on.
I've thought about looping through all cells of the status column and if the cell contains a certain value the color will change. ( in row data bound event ) . But I haven't done this because I don't find this idea as a good one because of the looping part.

use the RowDataBound event from the grid view to check what is the status. You don't need to do a loop because that event (if you register or not) is being called.
One thing to note, you will need to make sure you are looking at the right row (header, footer, alternate etc) so something like this
void YourGridViewName_RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Do your color change here by accessing the col with e.Row.Cells[column_index].BackColor = 'what ever you want'
}
}

You can enable the RowDataBound Event in the markup
<asp:GridView ID="gridview1" runat="server" OnRowDataBound="RowDataBound">
</asp:GridView>
And put this in your Code-Behind file.
protected void RowDataBound(Object sender, GridViewRowEventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
// Retrieve the underlying data item. In this example
// the underlying data item is a DataRowView object.
DataRowView rowView = (DataRowView)e.Row.DataItem;
// Retrieve the state value for the current row.
String state = rowView["state"].ToString();
//format color of the as below
if(state == "Closed")
(e.Row.FindControl("lbl1") as Label).BackColor = Color.Red;
if(state == "Open")
(e.Row.FindControl("lbl1") as Label).BackColor = Color.Green;
if(state == "Waiting")
(e.Row.FindControl("lbl1") as Label).BackColor = Color.Yellow;
}
}

You have to write code in the rowdatabound event of your grid view.
Example:
private GridView1_RowDatabound(object sender,EventArgs e)
{
if(e.Row.RowType == DataControlRowType.DataRow)
{
// You have to put your logic here.
if( e.Row.Cells[1].Text == "closed" )
{
// to get a reference to label control
Label lb = e.Row.FindControl("LabelCOntrolID");
}
}
}

Is it Possible to Change the text color for columns in Grid View based upon search item?

Note: i need to change in different columns based upon search request.

Yes you can do it in GridView.RowDataBound event
Like this
protected void yourGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[0].BackColor = Color.Beige;
// 0 could be any valid cell index in your row
}
}
for more info Go here

Clickable row in GridView and edit the row

I have a problem here regarding to editable gridview. what I want to do is replacing edit button function by using a single clickable row. When I click a row, it should be forwarding me to a new page for editing those row data. How can I achieve this, without using edit button?
protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
{
// only apply changes if its DataRow
if (e.Row.RowType == DataControlRowType.DataRow)
{
// when mouse is over the row, save original color to new attribute, and change it to highlight yellow color
e.Row.Attributes.Add("onmouseover",
"this.originalstyle=this.style.backgroundColor;this.style.backgroundColor='#EEFF00'");
// when mouse leaves the row, change the bg color to its original value
e.Row.Attributes.Add("onmouseout",
"this.style.backgroundColor=this.originalstyle;");
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
string abc = ((GridView)sender).DataKeys[e.Row.RowIndex].Value.ToString();
e.Row.Attributes["onClick"] = "location.href='Default.aspx?id=" + abc + "'";
//e.Row.Attributes["onClick"] = "location.href='Default.aspx?id=" + DataBinder.Eval(e.Row.DataItem, "CategoryID") + "'";
e.Row.Attributes.Add("style", "cursor:pointer;");
}
}

Simply add controls as you want to Default.aspx and on default.aspx pageload event(In not postback condition) retrieve the record through ID and populate the controls.
Now when submit button pressed update the record and redirect back to your original page

Selecting an Item in GridView with ITemplate Generated Button

I'm having trouble figuring out how could I use my imagebutton (see below) in my ITemplate to append the button's corresponding row data (ItemID) as a query string.
My ImageButton in my ITemplate:
ImageButton select_button = new ImageButton();
select_button.ID = "select_button";
select_button.ImageUrl = "~/Files/System/Icons/highlighter.png";
select_button.CommandName = "Select";
select_button.ToolTip = "Select";
container.Controls.Add(select_button);
Should I handle it in in the imagebutton's OnClick event (if so, is there a way to get the row where the button is located) or can I handle in in the GridView events (rowbinding, rowseleted, rowcommand, etc.)?
I'd be glad to elaborate more on my code upon request. ^ ^

You can set the ID in the CommandArgument property of your button control in the RowDataBound Event. Once you have an ID, you can track rows with it.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
DataRow dr = ((DataRowView)e.Row.DataItem).Row;
((Button)e.Row.FindControl("select_button")).CommandArgument = dr["IdColumn"].ToString();
}
}