how to hold data from the database

Question

Hi

i write the code for reading the data from the database its is working fine. the code for reading data is

public void getuid()
    {
        string str1;
        SqlConnection con = new SqlConnection("server=.;database=Ckom;uid=sa");
        SqlCommand cmd = new SqlCommand("select max(UserID) uid from UserDetail",con);
        SqlDataReader ddDr;
        con.Open();
        ddDr=cmd.ExecuteReader();
        while (ddDr.Read())
        {
            str1 = ddDr["uid"].ToString();
            Response.Write(str1]);
        }
    }

if i write Response.write(str1) method inside the while loop its working fine
but if i used same Response.write(str1) its showing me error that Use of unassigned local variable 'str1'

please help me i need the value
because with that value i need to read data from other table

please help me

Niradhip Chakraborty · Answer

Ya You need to assign string strS1=  ; in the beginning(check What Vimal says). This will alocate a memory space for strS1 variable.

Sreekanth · Answer

ididnt understand ur question? but.. if ur trying to ; select * from TABle where primarykey=Response.Write(str1) is error. selcet * from table where key=+str1+ is ok. But Imnot sure whther u can take select statement without closing datareader. So if ur tryng to get each seleratestr1 value and then corresnding values other details from another table.. better use dataset .

Vimal Kandasamy · Answer

Hi Its because u assign value inside the while loop only... Initially assign value for str1.it will solve your problem Ex: string str1=;