Must declare the scalar variable "#UserId" in Insert statement - c#-5.0

Question

I am absolute beginner, I can't solve the the problem, getting error & exception is being thrown at
objCommand.ExecuteNonQuery();
Exception Message : "Must declare scalar variable #userId."
private void btnRegister_Click(object sender, EventArgs e)
{
if (tbxUserName.Text == "" || tbxPassword.Text == "")
{
MessageBox.Show("Please enter values!");
return;
}
string strConnection;
strConnection = ConfigurationManager.ConnectionStrings["strConnection"].ConnectionString;
SqlConnection objConnection = new SqlConnection();
objConnection.ConnectionString = strConnection;
objConnection.Open();
string strSQL;
SqlCommand objCommand = new SqlCommand("SELECT * FROM LoginTable WHERE UserId='" + tbxUserName.Text + "';", objConnection);
SqlDataAdapter objAdapter = new SqlDataAdapter();
objAdapter.SelectCommand = objCommand;
objAdapter.Fill(objDataSet);
int i = objDataSet.Tables[0].Rows.Count;
if (i > 0)
{
MessageBox.Show("User Name " + tbxUserName.Text + " already exists");
tbxPassword.Text = "";
objDataSet.Clear();
}
else
{
strSQL = "INSERT INTO LoginTable(UserId, Password) VALUES(#UserId, #Password)";
objCommand.Parameters.AddWithValue("#UsesrId", tbxUserName.Text);
objCommand.Parameters.AddWithValue("#Password", tbxPassword.Text);
objCommand.CommandText = strSQL;
objCommand.ExecuteNonQuery();
objConnection.Close();
message = "Registered Successfully! " + "Welcome " + tbxUserName.Text;
this.Hide();
WelcomeForm wf = new WelcomeForm(message);
wf.Show();
}
}

Answer 1

You have typo in your code, change it as following.( #UsesrId != #UserId)
strSQL = "INSERT INTO LoginTable(UserId, Password) VALUES(#UserId, #Password)";
objCommand.Parameters.AddWithValue("#UserId", tbxUserName.Text);