Unlocking a column in excel using C#

I have the Microsoft .Office.Interop.Excel installed but my question is
I want to unlock a column H. I do have data to reach H1..H500  but it could be less rows.
I want to unlock only until the last row with data. It should not affect more than the last row with data.
whats the code?
zachvaldezAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
try the following:
Excel.Range all = app.get_Range("H:H", Type.Missing);
all.Locked = false;

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zachvaldezAuthor Commented:
I want to put gridlines in the column. Right now column is solid white with no gridlines. like the column look normal .
what is the code to do that in addition to above. THANKS!!!
Rgonzo1971Commented:
Hi,

pls try
        xlRange = (Excel.Range)xlWorkSheet.get_Range(xlWorkSheet.Cells[1, 8] as Excel.Range, (xlWorkSheet.Cells[xlWorkSheet.Cells.Rows.Count, 8] as Excel.Range).get_End(Excel.XlDirection.xlUp));

        xlRange.Locked = false;
        xlRange.Cells.Borders.LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuou

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Kyle's code changes the whole column

 Regards
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zachvaldezAuthor Commented:
Can Usedrange substitute on this or not? Does usedrange cover only to the last row of data or till the 65,000+
Last row?
Rgonzo1971Commented:
It depends on the data and usedrange is not very reliable
zachvaldezAuthor Commented:
What if I want to change background color of "J1"? How to reference the cell?
Rgonzo1971Commented:
then try
Excel.Range xlRange= (Excel.Range) xlWorkSheet.Cells[1, 8];
xlRange.Interior.Color = Excel.XlRgbColor.rgbYellow;

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zachvaldezAuthor Commented:
Is column J 10?
Rgonzo1971Commented:
then try
Excel.Range xlRange= (Excel.Range) xlWorkSheet.Cells[1, 10];
xlRange.Interior.Color = Excel.XlRgbColor.rgbYellow;
zachvaldezAuthor Commented:
It's not changing the color. Originally it was yellow on J1. Can the formatting start on J2 ..down instead because J1 is a header with background yellow?
Rgonzo1971Commented:
then try
        xlRange = (Excel.Range)xlWorkSheet.get_Range(xlWorkSheet.Cells[2, 10] as Excel.Range, (xlWorkSheet.Cells[xlWorkSheet.Cells.Rows.Count, 10] as Excel.Range).get_End(Excel.XlDirection.xlUp));

        xlRange.Locked = false;
        xlRange.Interior.Color =  Microsoft.Office.Interop.Excel.XlRgbColor.rgbYellow;

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zachvaldezAuthor Commented:
is  "as" a C# keyword? just asking
zachvaldezAuthor Commented:
this code:
range = xlsWorkSheet.UsedRange.Columns[10, Type.Missing]; covers whole column including header. Can you modify this to start at J2 instead because J1 is header and has the original yellow background.
Maybe this is easier to understand for me.
Rgonzo1971Commented: 
range = xlsWorkSheet.UsedRange.Columns[10, Type.Missing].Resize(xlsWorkSheet.UsedRange.Rows -1 , 1).Offset(1);

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zachvaldezAuthor Commented:
Excel.Range range4 = xlsWorkSheet.UsedRange.Columns[10, Type.Missing].Resize(xlsWorkSheet.UsedRange.Rows - 1, 1).Offset(1);

>>after the Resize, I have red underline on (xlsWorkSheet.UsedRange.Rows

getting this message ..(operator '-' cannot be applied to operands...)
Rgonzo1971Commented:
replace with
xlsWorkSheet.UsedRange.Rows.Count
zachvaldezAuthor Commented:
Bravo!
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