How to set some text to datagridview cell when its cell contains 0 value in c#

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I have a datagridview and its data from sql database..
My datagridview some cells filled with 0(zero) value.
I want to set a NULL text at where the 0 value is filled in the datagridview.

C#

//I'm using this code but not working
 private void dataGridView4_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
    {
        for (int i = 0; i < dataGridView4.Rows.Count; i++)
        {
            for (int j = 7; j < dataGridView4.Rows[i].Cells.Count; j++)
            {
                if (Convert.ToInt32(dataGridView4.Rows[i].Cells[j].Value) == 0)
                {
                    dataGridView4.Rows[i].Cells[j].Value = "Null";
                }

            }
        }

    }

//this query is what i used to get the data as 0 when there is no column in that table

select l.admission_number,l.student_class ,l.student_name,hindi,maths,social,l.telugu,l.english ,
'' as english_1,'' as english_2,l.science, '' as ns,'' as ps  
from lkg_to_seventh_marks as l
union all 
select e.admission_number ,e.student_class ,
e.student_name ,hindi,maths,social,e.telugu,'' as english,e.english_1 ,e.english_2,'' as science,e.ns,e.ps 
from eighth_to_ninth_marks as e

Posted 27-Oct-14 20:51pm

n shiva Ram

Updated 27-Oct-14 23:36pm

v2

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abdussalam143 28-Oct-14 3:36am

are you using asp.net of is it on windows form

n shiva Ram 28-Oct-14 5:33am

It is win-form

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Basmeh Awad · Answer 1 · 2014-10-27T21:46:00

then you can directly get the NULL value from database is SQL Statement

SQL

CASE WHEN YOURCOLUMN=0 THEN NULL ELSE YOURCOLUMN END

i am not sure which column is showing 0 for ex check the first column

SQL

select CASE WHEN l.admission_number=0 THEN NULL ELSE l.admission_number END ADMISSION_NUMBER,l.student_class ,l.student_name,hindi,maths,social,l.telugu,l.english ,
'' as english_1,'' as english_2,l.science, '' as ns,'' as ps  
from lkg_to_seventh_marks as l
union all 
select e.admission_number ,e.student_class ,
e.student_name ,hindi,maths,social,e.telugu,'' as english,e.english_1 ,e.english_2,'' as science,e.ns,e.ps 
from eighth_to_ninth_marks as e

abdussalam143 · Answer 2 · 2014-10-27T21:48:00

ASP.NET

<itemtemplate>
 <asp:label id="lblStatus" runat="server" text="<%# SetZeroToNull(Eval("value").ToString()) %>" xmlns:asp="#unknown" />
</itemtemplate>

now write SetZeroToNull() method in code behind like.

C#

private string SetZeroToNull(string value)
{
    if (value == "0")
    {
        return null;
    }
    else
    {
        return value;
    }
}

or you can write any thing you want

How to set some text to datagridview cell when its cell contains 0 value in c#

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