C# - how to check particular column and it's values

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Hi,

I have one datatable. it contains 100 columns.

the problem is i don't want to check all the columns in the table.

I just want to check column from 25 to 50 in sequence.

finally i have the score and that i want to compare in that column (25 to 50) values.

if any score value is matching then we want to return find the  column name.

How to do this using data row.

below is code for sample.

                           

val1	val2	val3	…	…	val25	val26	…	val100
80	100	20	90	20	90	80	40	30




int Score = 80;

 foreach (DataRow row in result)

    {
         // Here i want to check row[25] to row[50]

         
   }

Output : val26 (if it is matching values then return column name)

(val26 is a columnname)

What I have tried:

foreach (DataRow row in result)

   {
        // Here i want to check row[25] to row[50]


  }

Posted 13-Oct-17 0:18am

gani7787

Updated 13-Oct-17 0:37am

v2

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Comments

Richard MacCutchan 13-Oct-17 6:21am

Just use a normal for loop of columns from 25 to 50.

2 solutions

Solution 1

try

foreach (DataRow row in dt.Rows)
           {
               for (int i = 25; i <= 50; i++)
               {
                   if (row[25].ToString() == Score.ToString())
                   {
                       string columnName = dt.Columns[i].ColumnName;
                       // your code..
                   }
               }
           }

Posted 13-Oct-17 0:36am

Karthik_Mahalingam

v2

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OriginalGriff · Accepted Answer · 2017-10-13T00:37:00

Solution 2

If you want to check a specific range, don't use a foreach, use a for instead:

foreach (DataRow row in result)
     {
     for (int colIndex = 25; colIndex <= 50; colIndex++)
         {
         Console.WriteLine(row[colIndex]);
         Console.WriteLine(myDataTable.Columns[colIndex].ColumnName);
         }
     }
 }

Posted 13-Oct-17 0:37am

OriginalGriff

Comments

gani7787 13-Oct-17 8:08am

In my table some of the columns has null values.

when i am executing i getting error

Error : Object cannot be cast from DBNull to other types.

for (int colIndex = 5; colIndex <= 35; colIndex++)
{
double str1 = Convert.ToDouble(row[colIndex]); // Error : Object cannot be cast from DBNull to other types.
if (str1 == Score)// compare maxvalue
{
ColName = dt.Columns[colIndex].ColumnName;
break; // if matching the value then get the columnname and then exit the loop
}
}

How to handle null values if the column and rows has null values...

OriginalGriff 13-Oct-17 8:14am

So check if the value in the cell is DBNull.Value before you cast it...

gani7787 13-Oct-17 8:46am

Thanks. it's working...

OriginalGriff 13-Oct-17 10:09am

You're welcome!