DataTable Creation

    public class DataTableHelper
    {
        /// 

        /// To Create Table Skeleton.
        /// 
        /// Table Column Name as an Array/// Column DataType as an Array/// Name of the DataTable/// 
        public DataTable CreateDataTable(string[] ColumnName, string[] DataType, string TableName)
        {
            // Create DataTable.   
            DataTable table = new DataTable(TableName);
            try
            {
                for (int i = 0; i < ColumnName.Length; i++)
                {
                    // Create DataColumns and add them to DataTable.   
                    table.Columns.Add(CreateDataColumn(DataType[i].Trim(), ColumnName[i].Trim(), "Column", false, false, false));
                }
            }
            catch (Exception)
            {
            }
            return table;
        }

        /// 

        /// To create the table structure
        /// 
        /// Column DataType/// ColumnName/// Column Caption/// Is Auto Increament/// IsReadOnly/// /// 
        private DataColumn CreateDataColumn(string colType, string name, string caption, bool autoInc, bool readOnly, bool unique)
        {
            DataColumn column = new DataColumn();
            try
            {
                column.DataType = System.Type.GetType(colType);
                column.ColumnName = name;
                column.Caption = caption;
                column.AutoIncrement = autoInc;
                column.ReadOnly = readOnly;
                column.Unique = unique;
            }
            catch (Exception)
            {
            }

            return column;
        }

        /// 

        /// Add Row to a DataTable
        /// //How to Call?
        /// //tempDt = oblDataTableHelper.AddRowsToTable(strArrField, tempDt);
        /// 
        /// Column Data as String Array/// Name of DataTable to add the Row/// 
        public DataTable AddRowsToTable(string[] value, DataTable table)
        {
            // Generate row with values for each column.   
            DataRow row = table.NewRow();
            try
            {
                //Add values to the columns
                for (int i = 0; i < value.Length; i++)
                    row[i] = value[i];

                // Add row to table.   
                table.Rows.Add(row);
            }
            catch (Exception)
            {
            }

            return table;
        }

        /// 

        /// Check whether the table contains Duplicate value for a particular column
        /// 
        /// DataTable/// Name of Column to Check for Duplicate/// 
        public bool HasDuplicates(DataTable table, string columnName)
        {
            bool IsContainsDuplicates = false;
            try
            {
                Hashtable hTable = new Hashtable();

                foreach (DataRow row in table.Rows)
                    if (!hTable.Contains(row[columnName]))
                        hTable.Add(row[columnName], null);
                    else
                    {
                        IsContainsDuplicates = true;
                        break;
                    }
            }
            catch (Exception)
            {
            }

            return IsContainsDuplicates;
        }

        /// 

        /// Remove rows for certains columns contains duplicate value
        /// //How to Call?
        /// tempDt = oblDataTableHelper.RemoveDuplicateRows(tempDt, new System.Collections.Generic.List(ColumnName));
        /// 
        /// DataTable Instance/// ColumnName as List/// 
        public DataTable RemoveDuplicateRows(DataTable table, List keyColumns)
        {
            //DataTable results = myDataTable.AsEnumerable().Distinct().CopyToDataTable();

            DataTable duplicateTable = table.Clone();
            DataColumn[] primaryKey = new DataColumn[duplicateTable.Columns.Count];
            duplicateTable.Columns.CopyTo(primaryKey, 0);
            duplicateTable.PrimaryKey = primaryKey;

            DataRow[] dataRows = new DataRow[table.Rows.Count];
            table.Rows.CopyTo(dataRows, 0);
            foreach (DataRow dataRow in dataRows)
                if (duplicateTable.Rows.Contains(dataRow.ItemArray))
                    table.Rows.Remove(dataRow);
                else
                    duplicateTable.Rows.Add(dataRow.ItemArray);

            return table;
        }

        //tempDt = oblDataTableHelper.RemoveDuplicateRows(tempDt, ColumnName);
        /// 

        /// Remove rows for certains columns contains duplicate value
        /// 
        /// DataTable Instance/// ColumnName as Array/// 
        public DataTable RemoveDuplicateRows(DataTable dTable, string[] strColumns)
        {
            // create a dv from the source dt 
            DataView dv = new DataView(dTable);
            // set the output columns array of the destination dt 
            // true = yes, i need distinct values. 
            return dv.ToTable(true, strColumns);
        }
    }

Calling The Function

DataTableHelper oblDataTableHelper = new DataTableHelper();
string[] ColumnName = new string[] { "Column1", "Column2", "Column3", "Column4" };
string[] DataType = new string[] { "System.String", "System.String", "System.String", "System.String" };
System.Data.DataTable tempDt = null;
tempDt = oblDataTableHelper.CreateDataTable(ColumnName, DataType, "DataTableName");

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