Generate SQL query with dynamic table and column name in ASP.Net using C# and VB.Net

Hi tanweeruddinb...

Check this example. Now please take its reference and correct your code.

Namespaces

C#

using System.Configuration;
using System.Data;
using System.Data.SqlClient;

VB.Net

Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    List<string> columns = new List<string>();
    columns.Add("CustomerId");
    columns.Add("Name");
    columns.Add("Country");
    DataTable dt = GetData(columns, "Customers", "CustomerId", "1");
}

private DataTable GetData(List<string> columns, string table, string whereColumn, string whereColumnValue)
{
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    string query = string.Format("SELECT {0} FROM {1} WHERE {2} = {3}", string.Join(",", columns), table, whereColumn, whereColumnValue);
    using (SqlConnection con = new SqlConnection(conString))
    {
        SqlCommand cmd = new SqlCommand(query);
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataTable dt = new DataTable())
            {
                sda.Fill(dt);
                return dt;
            }
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim columns As List(Of String) = New List(Of String)()
    columns.Add("CustomerId")
    columns.Add("Name")
    columns.Add("Country")
    Dim dt As DataTable = GetData(columns, "Customers", "CustomerId", "1")
End Sub

Private Function GetData(ByVal columns As List(Of String), ByVal table As String, ByVal whereColumn As String, ByVal whereColumnValue As String) As DataTable
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Dim query As String = String.Format("SELECT {0} FROM {1} WHERE {2} = {3}", String.Join(",", columns), table, whereColumn, whereColumnValue)
    Using con As SqlConnection = New SqlConnection(conString)
        Dim cmd As SqlCommand = New SqlCommand(query)
        Using sda As SqlDataAdapter = New SqlDataAdapter()
            cmd.Connection = con
            sda.SelectCommand = cmd
            Using dt As DataTable = New DataTable()
                sda.Fill(dt)
                Return dt
            End Using
        End Using
    End Using
End Function