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Can't read all rows from GUIGridView. Getting blank after 34 rows

I am doing SAP automation, there i am reading data from GUIGridview and adding to a DataTable using a for loop. But after 34 rows every values are empty. Then I tried with setting the current cell using a condition
if (rowindex % 34== 0)
grd.SetCurrentCell(rowindex, grd.FirstVisibleColumn);
After that i am able to get the values of 35, 36th row but again then blank values from there. Total i am having 91 rows.

The backend doesn't send all the grid rows to the frontend, only the ones currently viewed.
You must scroll the grid via the property FirstVisibleRow, and use the other properties RowCount and VisibleRowCount to scroll only when required.
Example:
for (int rowindex = 0; rowindex < grd.RowCount; rowindex = rowindex + 1)
{
// Position at top if first time or scroll to display next page
if ( rowindex % grd.VisibleRowCount == 0 )
{
grd.FirstVisibleRow = rowindex
}
// Process the line
...
}
More information: SAP Library - GuiGridView

Linking the Cells of a spreadsheet like excel to be able to perform formulas c#. Eg: A1 +C8

In Our assignment we were given a task to create a new spreadsheet program with a 26 x 26 grid of textboxes without importing anything and make use of array (in my case I Used array of objects).
I created a 2 d array of objects containing size of grid (27x27). the reason of it being 27 instead of 26 is because the first row and column is to show the ABCDE etc and 12345 etc of the rows and columns.
now the rows indexation I had no problem because it is numeric. however, the letters I solved by creating a string array with alphabet from a to z and entering them through a for loop and it worked.
Now the next step is to be able to link the cells, however, I am a bit stumped, because people told me I have to use Ascii or smthin.
Can anyone help me plz on how to achieve the cell links?
I have been able to past the name of each cell using this code but I fear I just filled the .Text of the cells not the cells name per se:
for (int x = 1; x < TwoDArrayCells.GetLength(0); x++) //nested loop to create the grid of textboxes.
{
for (int y = 1; y < TwoDArrayCells.GetLength(1); y++)
{
Cells CellFields = new Cells(Name = $"{AlphabetRow[x]}{y}", x, y + 3); // called a new cell named CellFields.
CellFields.Text = Name;//Change to location if you wise to take
this.Controls.Add(CellFields);
}
}
The result I would like is to be able to after this be able to link cells. meaning if I insert in a text box A1 + A2 it knows that a1 is the first box in the first row of first column and the a2 is the box in the second row of the first column.

Assuming that Columns can be A-Z only (Capitals), You can extract the column index and row index as follows:
Given a cell, string cell = "A2";
- the column index: int column = cell[0] - 'A' + 1;
- the row index: int row = Convert.ToInt32(cell.Substring(1));
Explanation: for the column, take the first letter, subtract it from 'A' (the subtraction will be performed on the assci codes of the characters) and add 1 since your actual cells are stored starting from index 1. for the row, just parse the rest of the string to int.

jQuery calculate column count from excel range

I have a C# web form where a user inputs data about an excel file into a number of text boxes, including:
TXT_FirstDataRow - integer field which represents the first row that contains data
TXT_LastDataColumn - string field which represents the last column that contains data
TXT_Range - string field which contains the calculated data range using the above two fields
TXT_ColumnCount - The number of columns in the calculated range
I am currently using jQuery to automatically calculate the data range using the code below which works perfectly:
$('#TXT_FirstDataRow,#TXT_LastDataColumn').keyup(function () {
var row = $('#TXT_FirstDataRow').val();
var column = $('#TXT_LastDataColumn').val();
var range = 'A' + row + ':' + column; //All ranges start at column A
$('#TXT_Range').val(range);
});
I would now like to automatically populate the TXT_ColumnCount with the count of the columns. For example:
Range |Column Count
------+------------
A1:C |3
A7:BX |76
I imagine that this should be made easier as the ranges will always be starting from column A, so the column count should just be the equivalent column number of TXT_LastDataColumn, but I am afraid even this is beyond my slightly limited jQuery knowledge.
Any help would be greatly appreciated.
Thanks

I found an answer on SO that helped me, link below:
Convert excel column alphabet (e.g. AA) to number (e.g., 25)
function letterToNumbers(string) {
string = string.toUpperCase();
var letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', sum = 0, i;
for (i = 0; i < string.length; i++) {
sum += Math.pow(letters.length, i) * (letters.indexOf(string.substr(((i + 1) * -1), 1)) + 1);
}
return sum;
}

How to read a column cell in Listview

I try to read whole rows of a given column in listview
As I'm new in C# and use of listview I saw it does not work as List
Below is the code that I use (What I found as solution in some sites)
for (int i = 0; i < rapview.Items.Count; ++i)
{
int idx = 0;
foreach (ColumnHeader header in rapview.Columns)
{
if (header.Text == "Bak. €")
{
MyArray[0] = GeneralMethod.GetClientName(conn, rapview.Items[1].Text);
di = new ListViewItem(MyArray);
tmpView.Items.Add(di);
}
++idx;
}
}
I want to retrieve 1st column 7th column cells, but I see that rapview.Items[1].Text is empty and similar for 7th cell.
Either I miss something or given solution is not correct.
How to read the value of those cells. If possible with column number by bypassing the foreach loop?

This is a loop that copies every value in the 7th column to a list of strings.
If there is no 7th column in the row it adds an empty string.
int column = 6;
List<string> values = new List<string>();
foreach (ListViewItem lvi in rapview.Items)
if (lvi.SubItems.Count - 1 < column) values.Add("");
else values.Add(lvi.SubItems[column].Text);
Note that C# counts zero-based, so the 7th column is indexed as 6.
You could test the value in row 1 column 7 as:
Console.WriteLine("Cell 7 in row 1 contains:" + values[0]);
Note that every Item in a ListView can have its own number of SubItems. Therefore we must test it before we access it!
Also note that SubItem[0] has the same value/text as the Item!

Comparing two datagridviews

I have two datagridviews in one form. The first, datagridview1 has columns and data:
name IC EMAIL TELEPHONE
------------------------------------------------------
rOO 898989096677 AB#YAHOO.COM 018-9097878
datagridview2 has
name IC EMAIL TELEPHONE ID
-----------------------------------------------------------
rOO 898989096677 AB#YAHOO.COM 018-9097878 8787
I would like to ask help on how to compare two datagridviews, as you can see in the figure I would like to compare the four columns from one datagridview to another datagridview and see if any results match. For example, does the roo name match with the another datagridview, I want the value in the id (8787) to be sent to another datagridview.

there is a very simple solution to compare twoo datagridview and show their result in 3rd one.
for (int i = 0; i < dtView1.Rows.Count; i++)
{
for (int j = 1; j < dtView1.Columns.Count; j++)
{
if ((dtView1.Rows[i][j]) == (dtView2.Rows[i][j]))
{
// here you can add your own logic
}
else
{
// here you can add your own logic
}
}
|

Let's assume that you populate both datagrids with the same objects that contain these 4 properties from your example. You must check for the selected row from the first datagrid if in the second datagrid there is an matching object, based on your filters. Use Linq. If so, then copy the data from the selected item from the first datagrid into the matching element from the seconds. I am affraid that you will need to do all these steps manually, because there is no method that can compare two data grids and you just set some filters and the job is done. You will have some work to do, but it is not hard. Good luck.

Steve's answer does not work correctly and will not compile.
Here is my solution:
int x = 0;
int y = 0;
int i = -1;
int z = 0;
foreach (DataGridViewRow row in dataGridView1.Rows)
{
i++;
if ((dataGridView1.Rows[i].Cells[i].Value) == (dataGridView2.Rows[z].Cells[i].Value))
{
x++;
}
else
{
y++;
}
if (z < dataGridView2.Rows.Count)
{
z++;
}
if(z == dataGridView2.Rows.Count)
{
z--; //subtract 1 from the total count because the datagrid is 0 index based.
}
MessageBox.Show("Matched: " + x.ToString() + "\r\n" + "Not Matched: " + y.ToString());
A foreach loop on the datagrid will cycle through each row, you can then select a cell or even cells to compare. This code is a bit lengthy and I'm sure it can be simplified, however it does the job.
Currently this will check every row from datagrid 2 for a match in datagrid 2, only on a single column.
Its import to remember the datagrid is 0 index based. The Count property of the datagrid gives a [1]index based count, so we need to subtract the last iteration on datagrid 2.