GridView Cell Color Red If Text Empty?

Posted on 2011-03-03
Last Modified: 2012-05-11
The following code changes the entire column to Red, however I would like to just change Only cells with empty text.

Q. How can I change Only certain Cells Red and not the entire column?

    protected void gridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        if (e.Row.RowType == DataControlRowType.DataRow)
                e.Row.Cells[7].BackColor = System.Drawing.Color.Red;
Question by:pointeman
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LVL 10

Expert Comment

ID: 35032861
maybe coz your that column would be empty that's why the condition is true to get the cell color Red
LVL 11

Accepted Solution

MajorBigDeal earned 500 total points
ID: 35033337
I was having a similar problem and I used the following logic in the page load event instead of the row binding to get around it.

DataTable dt = (DataTable)gridView.DataSource;
int rowIndex = 0;
foreach (GridViewRow gvr in gridView.Rows)
gvr.DataItem = dt.Rows[rowIndex++];
DataRow dr = (DataRow)gvr.DataItem;                
object[] oa = dr.ItemArray;
if (oa[7].ToString().Length == 0)
gvr.Cells[7].BackColor = System.Drawing.Color.Red;

Author Comment

ID: 35037079
Okay, here's how it's done in RowDataBound (similar to MajorBigDeal).

I can now read text of both:
asp:TemplateField (Text='<%# Bind("FirstName") %>'>).

    protected void gridView1_RowDataBound(object sender, GridViewRowEventArgs e)
            foreach (GridViewRow row in gridView1.Rows)
                if(row.Cells[6].Text == "10")
                row.Cells[6].BackColor = System.Drawing.Color.Red;

                if(((Label)row.FindControl("label1")).Text == "Jim")
                    ((Label)row.FindControl("label1")).BackColor = System.Drawing.Color.Green; //right-next to cell[6].

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Author Comment

ID: 35037372
New Problem:
  1. asp:CommandField won't 'fire', throws error:
        "Object reference not set to an instance of an object."
However, asp:ButtonField works fine.
LVL 11

Expert Comment

ID: 35041069
Yes but it doesn't make sense to put that in row data bound because you are iterating the entire grid for every row. For example, if your grid has 100 rows , your loop will run 10000 times.  I guess it doesn;t really matter but I think it would be better in the page load.  

I want to help with your new problem, but there isn't enough info,  Also, if you open a new question for that, you'll probably get more responses since experts are always jumping on new questions.

Author Comment

ID: 35059938
I'll give you points because your solution works, but not in RowDataBound.

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