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I am storing some data into a variable at Page Load event. And I have a gridview in the same page which is getting data from SQL database. What i want is to also add another column in the gridview and populate it with the value in the variable from Page Load event.
Is there any way for this? I want to do this because i am calculating something which will be changed with respect to change in date, so therefore i want to fetch data from page load and populate the gridview with it.

What I have tried:

Searched google and other forums but could not find anything related to this.
Updated 7-Oct-16 12:38pm
ZurdoDev 6-Oct-16 14:04pm
Search for how to dynamically add a column to gridview.

A data representation control like GridView can only handle one DataSource at a time. Since your data is coming from different sources (database and code variable), then you may need create a custom DataTable that would holds all the information you need from your sources. You could then use that custom DataTable as your final DataSource for your GridView.

Here's a quick example: (PS: Never tested on this, but it should give you some idea)
private void BindGrid(DataDaTable source)
        //create your final datasource
        DataTable dt = new DataTable();
        DataRow dr;

        //define new sets of columns that you need
        dt.Columns.Add(new System.Data.DataColumn("Column1", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Column2", typeof(String)));
        dt.Columns.Add(new System.Data.DataColumn("Column3", typeof(String)));
        //you can add more columns here if needed

        //fill your new DataTable with data from your sources
        int rowCount = source.Rows.Count;
	if ( rowCount > 0){
            for(int i=0; i < rowCount; i++){
            dr = dt.NewRow();
            dr[0] = source.Rows[i]["ColumnName"].ToString();
            dr[1] = source.Rows[i]["ColumnName"].ToString();
	    dr[2] = "Your custom variable value here";
	GridView1.DataSource = dt;

Alternatively, you could just add a new Column to your existing DataTable something like:
DataColumn newColumn = new DataColumn("ColumnName", typeof(System.String));
newColumn.DefaultValue = "Your variable value";
I have tried below

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication1
    public partial class WebForm3 : System.Web.UI.Page
        string customColumn = string.Empty;
        protected void Page_Load(object sender, EventArgs e)
            customColumn = "INDIA";
        protected void Button1_Click(object sender, EventArgs e)
            DataTable table = new DataTable();
            table.Columns.Add("Dosage", typeof(int));
            table.Columns.Add("Drug", typeof(string));
            table.Columns.Add("Patient", typeof(string));
            table.Columns.Add("Date", typeof(DateTime));

            // Here we add five DataRows.
            table.Rows.Add(25, "Indocin", "David", DateTime.Now);
            table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
            table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
            table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
            table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);

            //Add new column  in gridview if its not set true for autogenerare columns
            //BoundField test = new BoundField();
            //test.DataField = "Country";
            //test.HeaderText = "Country";

            //add  new column for your custom variable to datasource
            table.Columns.Add(new DataColumn("Country"));

            GridView1.DataSource = table;


        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
            if (e.Row.RowType == DataControlRowType.DataRow)
                //putting data in column Conditionaly 
                if (Convert.ToDateTime(e.Row.Cells[3].Text)<DateTime.Now)
                    e.Row.Cells[4].Text = customColumn;

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