How to remove columns after particular columns in datatable using C#?

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I want to remove columns from data table after particular columns.I have used Remove method but this is delete the '("Lead Time (WEEKS)"))' columns i want to remove after the '("Lead Time (WEEKS)"))' columns.
How to do it
I have used below code.

What I have tried:

C#

for (int i = 0; i < ds.Tables.Count; i++)
               {
                   for (int j = 0; j < ds.Tables[i].Columns.Count; j++)
                   {
                       if (ds.Tables[i].Rows[7][j].ToString().Trim().Contains("Lead Time (WEEKS)"))
                       {
                           int y = j;
                           if (ds.Tables[i].Rows[7][y + 1].ToString().Trim() == "" || ds.Tables[i].Rows[7][y + 1].ToString().Trim() != "")
                           {
                               int y1 = y + 1;
                               ds.Tables[i].Columns.RemoveAt(y1);
                           }
                       }
                   }
               }

Posted 31-Oct-16 19:51pm

Raja Ganapathy

Updated 3-Nov-16 17:15pm

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Comments

Wendelius 1-Nov-16 2:02am

Few questions, why do you want to remove columns from the data table and what is the problem you're facing with your code?

Raja Ganapathy 1-Nov-16 2:12am

This data set is excel file. i upload the excel and convert as dataset and sheets are into datatables.if the user not delete the empty columns after the data fields.some problems are occur. i have do some validation using columns count so the validation is affected for those empty columns or unwanted datas.

3 solutions

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Suvendu Shekhar Giri · Accepted Answer · 2016-10-31T20:09:00

You can first get the index of the column afterwards which you want to delete the columns. For that you can use DataColumn.Ordinal Property (System.Data)[^].

Something like-

C#

int indexOfMyCol = myDataTable.Columns["Lead Time (WEEKS)"].Ordinal;

Now you can run a loop to remove columns starting from indexOfMyCol + 1

Hope, it helps :)
Please let me know if your requirement is something other than this.

KARTHICKEYANRAJU · Accepted Answer · 2016-11-01T00:59:00

C#

Hi, 

I am not good at this. But try below for your scenario

int indexofLeadTimeWEEKS = 0;
for (int i = 0; i < ds.Tables.Count; i++)
{
	if (ds.Columns[i].ColumnName == "Lead Time (WEEKS)")	
        {
         	indexofLeadTimeWEEKS = i;
        }
	if(indexofLeadTimeWEEKS != 0)
	{
		ds.Columns.Remove(ds.Columns[i].ColumnName);
		i = i -1;
		indexofLeadTimeWEEKS = indexofLeadTimeWEEKS - 1;
	}
}


-Karthick Raju

Karthik_Mahalingam · Accepted Answer · 2016-11-03T17:15:00

Solution 3

try this

C#

foreach (DataTable dt in ds.Tables)
       {
           bool flag = false;
           foreach (DataColumn col in dt.Columns)
           {
               if (col.ColumnName == "Lead Time (WEEKS)")
                   flag = true;
               if (flag && col.ColumnName != "Lead Time (WEEKS)")
                   dt.Columns.Remove(col);
           }
       }

Posted 3-Nov-16 17:15pm

Karthik_Mahalingam

Comments

Raja Ganapathy 5-Nov-16 1:18am

Thanks to all.

Karthik_Mahalingam 8-Nov-16 2:06am

welcome :)

How to remove columns after particular columns in datatable using C#?

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