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I build a Work management software and am having a small problem as follows:

I have a label "Hard work" display and 1 Data_Gird_view , I want to show the form if there is line >= 30 in column "Total Time" then label "Hard work" +1

If there are 4 lines >= 30 then label "Hard work" +4

But I don't know which string will compare an integer with a column in Data_Gird_view. Everyone please help or suggest me

Please see the picture below to understand what I mean
As shown in the picture above. in column "Total Time" I have 4 rows greater than 30. so I want label HarkWork = 4

What I have tried:

<pre>db.fillDataGridView("select * from [tbl_RequestSMT]", dataGridView1);
            IEnumerable<DataGridViewRow> rows = dataGridView1.Rows

         .Where(r => r.Cells["TotaTime"].Value.ToString().Equals("30"));

            if (rows.Count() == 0)
                // Not Found .

                // Found
                // if label "Hard Work ++"  but i don't know code here :(

Updated 23-Oct-20 10:25am
BillWoodruff 23-Oct-20 0:35am
the picture link does not work
Sơ Mi Tv 23-Oct-20 14:14pm
You can copy and paste new tag browser

 // assume the Label is named 'lblHardWorkCount

const string HardWorkLabelText = "Hard Work Count: {0}";
const int HardWorkThreshold = 30;

// to be executed in some method or event handler:

IEnumerable<DataGridViewRow> rows = dataGridView1.Rows.Cast<DataGridViewRow>().Where(r => ((Int32) r.Cells["TotalTime"].Value) >= HardWorkThreshold);

lblHardWorkCount.Text = string.Format(HardWorkLabelText, rows.Count());
Note: I suggest you wrap this in a try-catch block while developing in case you have bad data.
Sơ Mi Tv 23-Oct-20 9:29am
I've try code but not run. errors appear:
'System.InvalidCastException: 'Specified cast is not valid.'

I try breackpoint > IEnumerable<datagridviewrow> rows = dataGridView1.Rows.Cast<datagridviewrow>().Where(r => ((int)r.Cells["TotalTime"].Value) == HardWorkThreshold);

results return: rows null
BillWoodruff 23-Oct-20 9:47am
the code you show is not the same as the code i posted: i verified that code running against a DataGridView with a Column of Type Int32.

Is the Column named "Total Time," or "TotalTime" ?
Sơ Mi Tv 23-Oct-20 9:54am
Columns in my Datagirdview name "TotalTime" or [07]. I tried 2 name but not run
Sơ Mi Tv 23-Oct-20 10:00am
I also tried your code but the results are still the same
BillWoodruff 23-Oct-20 10:43am
then you need to examine the structure of your DataGridView carefully. do you have an integer column named "TotalTime" ?

put breakpoints in your code and single step through it: identify exactly where the error occurs.

i guarantee you the code i posted works !
Sơ Mi Tv 23-Oct-20 16:29pm
I update code below,please see and help me fix it
special thanks!
Just show the "total lines" and the number / index of the current / selected line; e.g. "15 of 34". (If the user resizes the screen, your calcs go off anyway).
Sơ Mi Tv 22-Oct-20 18:15pm
I have label total lines already. But I need show difficult work in other label (if on columns Total Time have columns >= 30, labels "Hard Work ++")
Below source code use in project. please see and help me fix it:
(Please copy and paste new tag browse)

public void BtnSearch_Click(object sender, EventArgs e)

           db = new DbConnector();
           lbTotal.Text = "00";

           db.fillDataGridView("select *from tbl_WorkLoad where TimeComplete Between'" + dateTimePicker1.Value.ToString("dd-MM-yy| HH:mm:tt") + "' and '" + dateTimePicker2.Value.ToString("dd-MM-yy| HH:mm:tt") + "'", dataGridView1);
           const string HardWorkLabelText = "Hard Work Count: {0}";
           const int HardWorkThreshold = 30;

               IEnumerable<DataGridViewRow> rows = dataGridView1.Rows.Cast<DataGridViewRow>().Where(r => ((Int32)r.Cells["TotalTime"].Value) >= HardWorkThreshold);

               lbHardwork.Text = string.Format(HardWorkLabelText, rows.Count());

                   for (int i = 0; i < dataGridView1.Rows.Count; i++)
                       lbTotaltime.Text = (Convert.ToString(double.Parse(lbTotaltime.Text) + double.Parse(dataGridView1.Rows[i].Cells[7].Value.ToString())));


                       int iCount = 0;
                       for (int i = 0; i <= dataGridView1.RowCount - 1; i++)
                           if (dataGridView1.Rows[i].Cells[0].Value != null)
                               //if ((bool)dataGridView1.Rows[i].Cells[0].Value)

                               lbTotal.Text = iCount.ToString();
                           else continue;

           catch (Exception ex)

BillWoodruff 23-Oct-20 21:10pm
I'd like to help you, but, I've probably done as much as I can. Suggestion:

1. update your original post with the information in this post, then delete this post: this post is not a solution.

2. put a breakpoint at the start of the method, then single-step (F11) thought the code: examine the values at each step looking for unexpected results. identify exactly where the error is thrown.

3. define constants outside a method body, at the class level. what you do here will not throw an error ... imho, it should ! ... but, it's a very bad practice.

4. verify that the data in the TotalTime column really is a "normal" string that represents only integer values.

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