how convert a string to id

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if (!IsPostBack)
       {


           for (int b =23; b < 100;b++ )
           {
               conn.Open();
               cmd = new SqlCommand("select * from tbl_plotdetails where plotdetails_id='" + b + "' and status='vacant' ", conn);
               dr = cmd.ExecuteReader();
               dr.Read();
               if (dr.HasRows)
               {
                   int a = b;
                   string d = "G" + a;  // convert to td id   G23


                   //d.BgColor = System.Drawing.Color.White.ToString(); //cannot accept
                   //d.Style.Add("background-color", "red");

                   G23.Style.Add("border-color", "black");   // accept this
                   dr.Close();

               }
               else
               {

                   G23.Visible = false;

               }
               conn.Close();
           }

       }

how i change a string into id of a particular div

Posted 22-Jul-15 20:51pm

Arasappan

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3 solutions

Solution 1

You need to add runat="server" attribute to the DIV html tag and then can use control.findcontrol method to find the associated div. Check the link below.

Find div tag from code behind[^]

Posted 22-Jul-15 21:04pm

_Asif_

Comments

Arasappan 23-Jul-15 3:15am

<td id=g2>

i get string g2 mean
i want to use that string as a id

example

g2.visible=false;

for thid
string x=g2;
x.visible=false

Solution 3

C#

if (!IsPostBack)
        {

            for (int b =23; b < 100;b++ )
            {
                conn.Open();
                cmd = new SqlCommand("select * from tbl_plotdetails where plotdetails_id='" + b + "' and status='vacant' ", conn);
                dr = cmd.ExecuteReader();
                dr.Read();
                Control control=null;
                if (dr.HasRows)
                {
                    int a = b;
                    string d = "G" + a;  // convert to td id   G23
                    HtmlTableCell lbl = (HtmlTableCell)FindControl(d);

                    //d.BgColor = System.Drawing.Color.White.ToString(); //cannot accept
                    lbl.Style.Add("background-color", "red");

                    control.Style.Add("border-color", "black");   // accept this
                    dr.Close();

                }
                else
                {
                    //G23 object will not be accessible here
                    G23.Visible = false; //can be written as                  control.Visible = false;

                }
                conn.Close();
            }

        }

Posted 23-Jul-15 3:23am

Arasappan

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Praveen Kumar Upadhyay · Accepted Answer · 2015-07-22T21:06:00

You need to use Control.FindControl("id") method to access the object by passing the id.

C#

if (!IsPostBack)
        {
            
 
            for (int b =23; b < 100;b++ )
            {
                conn.Open();
                cmd = new SqlCommand("select * from tbl_plotdetails where plotdetails_id='" + b + "' and status='vacant' ", conn);
                dr = cmd.ExecuteReader();
                dr.Read();
                Control control=null;
                if (dr.HasRows)
                {
                    int a = b;
                    string d = "G" + a;  // convert to td id   G23
                    control = Page.FindControl(d);
                    
                    //d.BgColor = System.Drawing.Color.White.ToString(); //cannot accept
                    //d.Style.Add("background-color", "red");
                    
                    control.Style.Add("border-color", "black");   // accept this
                    dr.Close();
                   
                }
                else
                {
                    //G23 object will not be accessible here
                    G23.Visible = false; //can be written as                  control.Visible = false;
 
                }
                conn.Close();
            }
 
        }