//Inserting data into Database
public bool Insert(classContact c)
{
//Creating a default return type and setting its value to false
bool isSuccess = false;
//Step 1: Connect database
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//Step 2:Create a SQL Query to insert data
string sql = "INSERT INTO tblContact(FirstName, LastName, ContactNo, Address, Gender) VALUES(@FirstName, @LastName, @ContactNo, @Address, @Gender)";
//creating sql command using sql and conn
SqlCommand cmd = new SqlCommand(sql, conn);
//Creatig parameters to add data
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
//Connection open here
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs successfully then the value of rows will be greater than zero its value will be 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Method to update data in database from our application
public bool Update(classContact c)
{
//Create a default return type and set its default value to false
bool isSuccess = false;
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//SQL to update data in our database
string sql = "UPDATE tblContact SET FirstName=@FirstName, LastName=@LastName, ContactNo=@ContactNo, Address=@Address, Gender=@Gender WHERE ContactID=@ContactID";
//Creating sql command
SqlCommand cmd = new SqlCommand(sql, conn);
//Create parameters to add value
cmd.Parameters.AddWithValue("@FirstName", c.FirstName);
cmd.Parameters.AddWithValue("@LastName", c.LastName);
cmd.Parameters.AddWithValue("@ContactNo", c.ContactNo);
cmd.Parameters.AddWithValue("@Address", c.Address);
cmd.Parameters.AddWithValue("@Gender", c.Gender);
cmd.Parameters.AddWithValue("ContactID", c.ContactID);
//open database connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//if the query runs sucessfully then the value of rows will be greater than zero else its value will be zero
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
conn.Close();
}
return(isSuccess);
}
//Method to Delete Data from Database
public bool Delte(classContact c)
{
//Create a default return value and set its value to false
bool isSuccess = false;
//Create SQL connection
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//sql to delete data
string sql = "DELETE FROM tblContact WHERE ContactId=@ContactID";
//creating sql command
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("ContactID", c.ContactID);
//open connection
conn.Open();
int rows = cmd.ExecuteNonQuery();
//If the query run sucessfully then the value od rows is the greather than zero else its value is 0
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
}
finally
{
//Close connection
conn.Close();
}
return(isSuccess);
}