Processus de transaction - Erreur de blocage

Question

Je suis confronté à l'erreur de blocage lorsque je mets mes données à jour à partir du logiciel.

Voici mon code:

private void btn_upd_Click(object sender, EventArgs e) 
{ 
    try 
    { 
     SqlConnection con = new SqlConnection(Constr); 
     con.Open(); 
     string myquery = "Select Reg,Rank,Trade,Name,Wing,Father_name,Dob,Gender,Cast,Sect,Serial,Qualification,Tehseel,District,Cnic_No,Blood_Group,Height,Weight,Identification_Mark,Permanent_Add,Nameof_Spouse,Relation,Nameof_MaleKids,image1 from PersonalInfo where Reg='" + txt_srch.Text + "'"; 

     SqlCommand c = new SqlCommand(myquery, con); 

     SqlDataReader rd = c.ExecuteReader(); 

     if (!(rd.HasRows)) 
     { 
      MessageBox.Show("No such data to delete"); 
     } 
     else 
     { 
      string query; 

      query = "update PersonalInfo set Rank='" + textBox2.Text + "', Serial='" + SN.Text + "', Trade='" + textBox3.Text + "',Name='" + textBox4.Text + "',Wing='" + textBox5.Text + "',Father_name='" + textBox6.Text + "',Dob='" + textBox7.Text + "',Gender='" + textBox8.Text + "',Cast='" + textBox9.Text + "',Sect='" + textBox23.Text + "',Qualification='" + textBox10.Text + "',Tehseel='" + textBox24.Text + "',District='" + textBox21.Text + "',Cnic_No='" + textBox11.Text + "',Blood_Group='" + textBox12.Text + "',Height='" + textBox13.Text + "',Weight='" + textBox14.Text + "',Identification_Mark='" + textBox15.Text + "',Permanent_Add='" + textBox16.Text + "',Nameof_Spouse='" + textBox18.Text + "',Relation='" + textBox19.Text + "',Nameof_MaleKids='" + textBox20.Text + "',image1='" + ImageToBase64(pictureBox1.Image, System.Drawing.Imaging.ImageFormat.Jpeg) + "' where Reg='" + txt_srch.Text + "'"; 

      SqlCommand cmd = new SqlCommand(query, con); 
      cmd.ExecuteNonQuery(); 
      MessageBox.Show("Data Updated"); 
     } 
     con.Close(); 
    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message); 
    } 
} 

Answer 1

Tout d'abord, comme marc_s déjà dit, concaténer vos requêtes d'entrée directe de l'utilisateur est dangereux. Vous devriez certainement envisager de changer cette méthode et d'utiliser des requêtes paramétrées, comme suggéré.

Deuxièmement, essayez d'exécuter chaque requête dans sa propre connexion Open() et Close():

private void btn_upd_Click(object sender, EventArgs e) 
{ 
    try 
    { 
     SqlConnection con = new SqlConnection(Constr); 

     con.Open(); 

     string myquery = "Select Reg,Rank,Trade,Name,Wing,Father_name,Dob,Gender,Cast,Sect,Serial,Qualification,Tehseel,District,Cnic_No,Blood_Group,Height,Weight,Identification_Mark,Permanent_Add,Nameof_Spouse,Relation,Nameof_MaleKids,image1 from PersonalInfo where Reg='" + txt_srch.Text + "'"; 

     SqlCommand c = new SqlCommand(myquery, con); 

     SqlDataReader rd = c.ExecuteReader(); 

     con.Close(); 

     if (!(rd.HasRows)) 
     { 
      MessageBox.Show("No such data to delete"); 
     } 
     else 
     { 
      con.Open(); 

      string query; 

      query = "update PersonalInfo set Rank='" + textBox2.Text + "', Serial='" + SN.Text + "', Trade='" + textBox3.Text + "',Name='" + textBox4.Text + "',Wing='" + textBox5.Text + "',Father_name='" + textBox6.Text + "',Dob='" + textBox7.Text + "',Gender='" + textBox8.Text + "',Cast='" + textBox9.Text + "',Sect='" + textBox23.Text + "',Qualification='" + textBox10.Text + "',Tehseel='" + textBox24.Text + "',District='" + textBox21.Text + "',Cnic_No='" + textBox11.Text + "',Blood_Group='" + textBox12.Text + "',Height='" + textBox13.Text + "',Weight='" + textBox14.Text + "',Identification_Mark='" + textBox15.Text + "',Permanent_Add='" + textBox16.Text + "',Nameof_Spouse='" + textBox18.Text + "',Relation='" + textBox19.Text + "',Nameof_MaleKids='" + textBox20.Text + "',image1='" + ImageToBase64(pictureBox1.Image, System.Drawing.Imaging.ImageFormat.Jpeg) + "' where Reg='" + txt_srch.Text + "'"; 

      SqlCommand cmd = new SqlCommand(query, con); 

      cmd.ExecuteNonQuery(); 

      con.Close(); 

      MessageBox.Show("Data Updated"); 
     } 
    } 
    catch (Exception ex) 
    { 
     MessageBox.Show(ex.Message); 
    } 
}