C# hide and show buttons on click

I am trying to display run button which executes a stored procedure, that on click hides and another button appears showing a 'spinner/loader' button until the execution is complete returning back to run.

When I click run, the procedure executes although I don't see any change with the buttons. When I remove the code at the bottom, the buttons change after the stored procedure has finished.

At the top of my click event I have:

btnRun.Visible = false; LoadButton.Visible = true; 

and at the bottom:

LoadButton.Visible = false; btnRun.Visible = true; 

I am guessing this is to do with post back, is there away around this?

Edit: This is my click event -

protected void Run_Click(object sender, EventArgs e) { using (SqlConnection con = new SqlConnection(dbString)) using (SqlCommand cmd = new SqlCommand("dbo.ExecuteJob", con)) { try { btnRun.Visible = false; LoadButton.Visible = true; System.Threading.Thread.Sleep(100); string JobName = "CTIOM: " + ddlJob.SelectedItem.Text; cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@job_name", JobName); SqlParameter statusParameter = new SqlParameter { ParameterName = "@returnStatus", SqlDbType = SqlDbType.Int, //Size = 255, Direction = ParameterDirection.Output }; SqlParameter messageParameter = new SqlParameter { ParameterName = "@returnMessage", SqlDbType = SqlDbType.VarChar, Size = 1000, Direction = ParameterDirection.Output }; SqlParameter durationParameter = new SqlParameter { ParameterName = "@returnRunDuration", SqlDbType = SqlDbType.VarChar, Size = 8, Direction = ParameterDirection.Output }; cmd.Parameters.Add(statusParameter); cmd.Parameters.Add(messageParameter); cmd.Parameters.Add(durationParameter); con.Open(); IAsyncResult result = cmd.BeginExecuteNonQuery(); while (!result.IsCompleted) { System.Threading.Thread.Sleep(100); } cmd.EndExecuteNonQuery(result); string statusMessage = statusParameter.Value.ToString(); lblStatus.Visible = true; lblStatus.Text = statusMessage; string returnMessage = messageParameter.Value.ToString(); lblMessage.Visible = true; lblMessage.Text = returnMessage; } catch (SqlException ex) { ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('" + ex.Message.ToString() + "')", true); return; } finally { con.Close(); LoadButton.Visible = false; btnRun.Visible = true; } } }